15971663494 has 8 divisors (see below), whose sum is σ = 23992885008. Its totient is φ = 7974035160.

The previous prime is 15971663483. The next prime is 15971663501. The reversal of 15971663494 is 49436617951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5896602 + ... + 5899309.

It is an arithmetic number, because the mean of its divisors is an integer number (2999110626).

Almost surely, 2^15971663494 is an apocalyptic number.

15971663494 is a deficient number, since it is larger than the sum of its proper divisors (8021221514).

15971663494 is a wasteful number, since it uses less digits than its factorization.

15971663494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11796590.

The product of its digits is 4898880, while the sum is 55.

The spelling of 15971663494 in words is "fifteen billion, nine hundred seventy-one million, six hundred sixty-three thousand, four hundred ninety-four".