19513299690 has 48 divisors (see below), whose sum is σ = 50750598600. Its totient is φ = 5201903616.

The previous prime is 19513299679. The next prime is 19513299713. The reversal of 19513299690 is 9699231591.

19513299690 is a `hidden beast` number, since 19 + 513 + 29 + 9 + 6 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10166083929 + 9347215761 = 100827^2 + 96681^2 .

It is a super-2 number, since 2×19513299690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 267046 + ... + 332174.

Almost surely, 2^19513299690 is an apocalyptic number.

19513299690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19513299690 is an abundant number, since it is smaller than the sum of its proper divisors (31237298910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19513299690 is a wasteful number, since it uses less digits than its factorization.

19513299690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68471 (or 68468 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The spelling of 19513299690 in words is "nineteen billion, five hundred thirteen million, two hundred ninety-nine thousand, six hundred ninety".