15640652412 has 216 divisors, whose sum is σ = 50329751472. Its totient is φ = 4049740800.

The previous prime is 15640652371. The next prime is 15640652431. The reversal of 15640652412 is 21425604651.

15640652412 is a `hidden beast` number, since 1 + 5 + 6 + 406 + 5 + 241 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7236612 + ... + 7238772.

Almost surely, 2^15640652412 is an apocalyptic number.

15640652412 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 15640652412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25164875736).

15640652412 is an abundant number, since it is smaller than the sum of its proper divisors (34689099060).

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

15640652412 is a wasteful number, since it uses less digits than its factorization.

15640652412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 15640652412 in words is "fifteen billion, six hundred forty million, six hundred fifty-two thousand, four hundred twelve".