19357790864 has 20 divisors (see below), whose sum is σ = 37519215804. Its totient is φ = 9675412608.

The previous prime is 19357790849. The next prime is 19357790983. The reversal of 19357790864 is 46809775391.

It can be written as a sum of positive squares in 2 ways, for example, as 7995936400 + 11361854464 = 89420^2 + 106592^2 .

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

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, 171527 + ... + 261030.

Almost surely, 2^19357790864 is an apocalyptic number.

It is an amenable number.

19357790864 is a deficient number, since it is larger than the sum of its proper divisors (18161424940).

19357790864 is a wasteful number, since it uses less digits than its factorization.

19357790864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435362 (or 435356 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 19357790864 in words is "nineteen billion, three hundred fifty-seven million, seven hundred ninety thousand, eight hundred sixty-four".