19659929428 has 12 divisors (see below), whose sum is σ = 35334738292. Its totient is φ = 9564289920.

The previous prime is 19659929417. The next prime is 19659929447. The reversal of 19659929428 is 82492995691.

It can be written as a sum of positive squares in 2 ways, for example, as 16404998724 + 3254930704 = 128082^2 + 57052^2 .

It is a super-2 number, since 2×19659929428² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19659929428.

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, 66418533 + ... + 66418828.

Almost surely, 2^19659929428 is an apocalyptic number.

It is an amenable number.

19659929428 is a deficient number, since it is larger than the sum of its proper divisors (15674808864).

19659929428 is a wasteful number, since it uses less digits than its factorization.

19659929428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132837402 (or 132837400 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 64.

The spelling of 19659929428 in words is "nineteen billion, six hundred fifty-nine million, nine hundred twenty-nine thousand, four hundred twenty-eight".