19646808904 has 8 divisors (see below), whose sum is σ = 36837766710. Its totient is φ = 9823404448.

The previous prime is 19646808859. The next prime is 19646808953. The reversal of 19646808904 is 40980864691.

It can be written as a sum of positive squares in only one way, i.e., 13686660100 + 5960148804 = 116990^2 + 77202^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×19646808904² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1227925549 + ... + 1227925564.

Almost surely, 2^19646808904 is an apocalyptic number.

It is an amenable number.

19646808904 is a deficient number, since it is larger than the sum of its proper divisors (17190957806).

19646808904 is a wasteful number, since it uses less digits than its factorization.

19646808904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455851119 (or 2455851115 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 19646808904 in words is "nineteen billion, six hundred forty-six million, eight hundred eight thousand, nine hundred four".