155121001506 has 16 divisors (see below), whose sum is σ = 344713336800. Its totient is φ = 51707000484.

The previous prime is 155121001471. The next prime is 155121001547. The reversal of 155121001506 is 605100121551.

155121001506 is a `hidden beast` number, since 1 + 5 + 51 + 2 + 100 + 1 + 506 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 155121001506.

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 7 ways as a sum of consecutive naturals, for example, 1436305516 + ... + 1436305623.

It is an arithmetic number, because the mean of its divisors is an integer number (21544583550).

Almost surely, 2^155121001506 is an apocalyptic number.

155121001506 is an abundant number, since it is smaller than the sum of its proper divisors (189592335294).

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

155121001506 is a wasteful number, since it uses less digits than its factorization.

155121001506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872611150 (or 2872611144 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 155121001506 in words is "one hundred fifty-five billion, one hundred twenty-one million, one thousand, five hundred six".