155015801612 has 72 divisors (see below), whose sum is σ = 321955845120. Its totient is φ = 65097812640.

The previous prime is 155015801609. The next prime is 155015801683. The reversal of 155015801612 is 216108510551.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3574853 + ... + 3617955.

It is an arithmetic number, because the mean of its divisors is an integer number (4471608960).

Almost surely, 2^155015801612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155015801612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160977922560).

155015801612 is an abundant number, since it is smaller than the sum of its proper divisors (166940043508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155015801612 is a wasteful number, since it uses less digits than its factorization.

155015801612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43491 (or 43482 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 35.

The spelling of 155015801612 in words is "one hundred fifty-five billion, fifteen million, eight hundred one thousand, six hundred twelve".