15886947668 has 24 divisors (see below), whose sum is σ = 28571614344. Its totient is φ = 7723900800.

The previous prime is 15886947653. The next prime is 15886947677. The reversal of 15886947668 is 86674968851.

It can be written as a sum of positive squares in 4 ways, for example, as 9984406084 + 5902541584 = 99922^2 + 76828^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15886947598 and 15886947607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206798 + ... + 273018.

It is an arithmetic number, because the mean of its divisors is an integer number (1190483931).

Almost surely, 2^15886947668 is an apocalyptic number.

It is an amenable number.

15886947668 is a deficient number, since it is larger than the sum of its proper divisors (12684666676).

15886947668 is a wasteful number, since it uses less digits than its factorization.

15886947668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67883 (or 67881 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 68.

The spelling of 15886947668 in words is "fifteen billion, eight hundred eighty-six million, nine hundred forty-seven thousand, six hundred sixty-eight".