155121200156 has 72 divisors (see below), whose sum is σ = 303148137600. Its totient is φ = 69388388160.

The previous prime is 155121200093. The next prime is 155121200159. The reversal of 155121200156 is 651002121551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155121200159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2804375 + ... + 2859153.

It is an arithmetic number, because the mean of its divisors is an integer number (4210390800).

Almost surely, 2^155121200156 is an apocalyptic number.

It is an amenable number.

155121200156 is a deficient number, since it is larger than the sum of its proper divisors (148026937444).

155121200156 is a wasteful number, since it uses less digits than its factorization.

155121200156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54939 (or 54924 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 155121200156 in words is "one hundred fifty-five billion, one hundred twenty-one million, two hundred thousand, one hundred fifty-six".