155040518481 has 4 divisors (see below), whose sum is σ = 206720691312. Its totient is φ = 103360345652.

The previous prime is 155040518473. The next prime is 155040518497. The reversal of 155040518481 is 184815040551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155040518481 - 2³ = 155040518473 is a prime.

It is a super-2 number, since 2×155040518481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155040518401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25840086411 + ... + 25840086416.

It is an arithmetic number, because the mean of its divisors is an integer number (51680172828).

Almost surely, 2^155040518481 is an apocalyptic number.

It is an amenable number.

155040518481 is a deficient number, since it is larger than the sum of its proper divisors (51680172831).

155040518481 is an equidigital number, since it uses as much as digits as its factorization.

155040518481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51680172830.

The product of its (nonzero) digits is 128000, while the sum is 42.

The spelling of 155040518481 in words is "one hundred fifty-five billion, forty million, five hundred eighteen thousand, four hundred eighty-one".