15640563412 has 24 divisors (see below), whose sum is σ = 28828779840. Its totient is φ = 7404261120.

The previous prime is 15640563403. The next prime is 15640563439. The reversal of 15640563412 is 21436504651.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68337 + ... + 189607.

It is an arithmetic number, because the mean of its divisors is an integer number (1201199160).

Almost surely, 2^15640563412 is an apocalyptic number.

It is an amenable number.

15640563412 is a deficient number, since it is larger than the sum of its proper divisors (13188216428).

15640563412 is a wasteful number, since it uses less digits than its factorization.

15640563412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122991 (or 122989 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 15640563412 in words is "fifteen billion, six hundred forty million, five hundred sixty-three thousand, four hundred twelve".