155555557 has 8 divisors (see below), whose sum is σ = 157588992. Its totient is φ = 153535200.

The previous prime is 155555549. The next prime is 155555573. The reversal of 155555557 is 755555551.

155555557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155555557 - 2³ = 155555549 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155555597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21913 + ... + 28129.

It is an arithmetic number, because the mean of its divisors is an integer number (19698624).

Almost surely, 2^155555557 is an apocalyptic number.

It is an amenable number.

155555557 is a deficient number, since it is larger than the sum of its proper divisors (2033435).

155555557 is a wasteful number, since it uses less digits than its factorization.

155555557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6539.

The product of its digits is 546875, while the sum is 43.

The square root of 155555557 is about 12472.1913471531. The cubic root of 155555557 is about 537.8095503395.

It can be divided in two parts, 15555 and 5557, that added together give a palindrome (21112).

The spelling of 155555557 in words is "one hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-seven".