155515521201 has 32 divisors (see below), whose sum is σ = 213102489600. Its totient is φ = 100838110464.

The previous prime is 155515521193. The next prime is 155515521211. The reversal of 155515521201 is 102125515551.

It is not a de Polignac number, because 155515521201 - 2³ = 155515521193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155515521211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34184475 + ... + 34189023.

It is an arithmetic number, because the mean of its divisors is an integer number (6659452800).

Almost surely, 2^155515521201 is an apocalyptic number.

It is an amenable number.

155515521201 is a deficient number, since it is larger than the sum of its proper divisors (57586968399).

155515521201 is a wasteful number, since it uses less digits than its factorization.

155515521201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6425.

The product of its (nonzero) digits is 12500, while the sum is 33.

The spelling of 155515521201 in words is "one hundred fifty-five billion, five hundred fifteen million, five hundred twenty-one thousand, two hundred one".