19712657716 has 6 divisors (see below), whose sum is σ = 34497151010. Its totient is φ = 9856328856.

The previous prime is 19712657687. The next prime is 19712657753. The reversal of 19712657716 is 61775621791.

It can be written as a sum of positive squares in only one way, i.e., 18619694116 + 1092963600 = 136454^2 + 33060^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2464082211 + ... + 2464082218.

Almost surely, 2^19712657716 is an apocalyptic number.

It is an amenable number.

19712657716 is a deficient number, since it is larger than the sum of its proper divisors (14784493294).

19712657716 is a wasteful number, since it uses less digits than its factorization.

19712657716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4928164433 (or 4928164431 counting only the distinct ones).

The product of its digits is 1111320, while the sum is 52.

The spelling of 19712657716 in words is "nineteen billion, seven hundred twelve million, six hundred fifty-seven thousand, seven hundred sixteen".