155990586557 has 4 divisors (see below), whose sum is σ = 167989862460. Its totient is φ = 143991310656.

The previous prime is 155990586551. The next prime is 155990586581. The reversal of 155990586557 is 755685099551.

155990586557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755685099551 = 73877 ⋅10228963.

It can be written as a sum of positive squares in 2 ways, for example, as 32569059961 + 123421526596 = 180469^2 + 351314^2 .

It is a cyclic number.

It is not a de Polignac number, because 155990586557 - 2²² = 155986392253 is a prime.

It is a super-2 number, since 2×155990586557² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155990586493 and 155990586502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155990586551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5999637932 + ... + 5999637957.

It is an arithmetic number, because the mean of its divisors is an integer number (41997465615).

Almost surely, 2^155990586557 is an apocalyptic number.

It is an amenable number.

155990586557 is a deficient number, since it is larger than the sum of its proper divisors (11999275903).

155990586557 is a wasteful number, since it uses less digits than its factorization.

155990586557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11999275902.

The product of its (nonzero) digits is 85050000, while the sum is 65.

The spelling of 155990586557 in words is "one hundred fifty-five billion, nine hundred ninety million, five hundred eighty-six thousand, five hundred fifty-seven".