19957617118 has 16 divisors (see below), whose sum is σ = 30118154976. Its totient is φ = 9918292320.

The previous prime is 19957617107. The next prime is 19957617137. The reversal of 19957617118 is 81171675991.

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, 700255 + ... + 728197.

It is an arithmetic number, because the mean of its divisors is an integer number (1882384686).

Almost surely, 2^19957617118 is an apocalyptic number.

19957617118 is a deficient number, since it is larger than the sum of its proper divisors (10160537858).

19957617118 is a wasteful number, since it uses less digits than its factorization.

19957617118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30099.

The product of its digits is 952560, while the sum is 55.

The spelling of 19957617118 in words is "nineteen billion, nine hundred fifty-seven million, six hundred seventeen thousand, one hundred eighteen".