15121361556 has 120 divisors (see below), whose sum is σ = 45252025280. Its totient is φ = 4313253888.

The previous prime is 15121361509. The next prime is 15121361561. The reversal of 15121361556 is 65516312151.

15121361556 is a `hidden beast` number, since 1 + 51 + 21 + 36 + 1 + 556 = 666.

It is a super-2 number, since 2×15121361556² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 15121361556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1453140 + ... + 1463508.

Almost surely, 2^15121361556 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 15121361556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22626012640).

15121361556 is an abundant number, since it is smaller than the sum of its proper divisors (30130663724).

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

15121361556 is a wasteful number, since it uses less digits than its factorization.

15121361556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035 (or 11024 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 15121361556 in words is "fifteen billion, one hundred twenty-one million, three hundred sixty-one thousand, five hundred fifty-six".