15990666696 has 48 divisors (see below), whose sum is σ = 43446481260. Its totient is φ = 5313185280.

The previous prime is 15990666683. The next prime is 15990666719. The reversal of 15990666696 is 69666609951.

It can be written as a sum of positive squares in 2 ways, for example, as 12989160900 + 3001505796 = 113970^2 + 54786^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332245 + ... + 377316.

Almost surely, 2^15990666696 is an apocalyptic number.

It is an amenable number.

15990666696 is an abundant number, since it is smaller than the sum of its proper divisors (27455814564).

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

15990666696 is a wasteful number, since it uses less digits than its factorization.

15990666696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709886 (or 709879 counting only the distinct ones).

The product of its (nonzero) digits is 28343520, while the sum is 63.

The spelling of 15990666696 in words is "fifteen billion, nine hundred ninety million, six hundred sixty-six thousand, six hundred ninety-six".