15911255052 has 144 divisors (see below), whose sum is σ = 51762407424. Its totient is φ = 3999456000.

The previous prime is 15911255023. The next prime is 15911255099. The reversal of 15911255052 is 25055211951.

It is a happy number.

15911255052 is a `hidden beast` number, since 1 + 5 + 91 + 12 + 550 + 5 + 2 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 15911254998 and 15911255016.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6649 + ... + 178512.

Almost surely, 2^15911255052 is an apocalyptic number.

15911255052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15911255052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25881203712).

15911255052 is an abundant number, since it is smaller than the sum of its proper divisors (35851152372).

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

15911255052 is a wasteful number, since it uses less digits than its factorization.

15911255052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185220 (or 185215 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

It can be divided in two parts, 159 and 11255052, that added together give a palindrome (11255211).

The spelling of 15911255052 in words is "fifteen billion, nine hundred eleven million, two hundred fifty-five thousand, fifty-two".