155503235121 has 16 divisors (see below), whose sum is σ = 230489495040. Its totient is φ = 92607384960.

The previous prime is 155503235113. The next prime is 155503235149. The reversal of 155503235121 is 121532305551.

It is a happy number.

It is not a de Polignac number, because 155503235121 - 2³ = 155503235113 is a prime.

It is a super-2 number, since 2×155503235121² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155503235101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64309476 + ... + 64311893.

It is an arithmetic number, because the mean of its divisors is an integer number (14405593440).

Almost surely, 2^155503235121 is an apocalyptic number.

It is an amenable number.

155503235121 is a deficient number, since it is larger than the sum of its proper divisors (74986259919).

155503235121 is a wasteful number, since it uses less digits than its factorization.

155503235121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128621416.

The product of its (nonzero) digits is 22500, while the sum is 33.

The spelling of 155503235121 in words is "one hundred fifty-five billion, five hundred three million, two hundred thirty-five thousand, one hundred twenty-one".