19557006913 has 4 divisors (see below), whose sum is σ = 19558768468. Its totient is φ = 19555245360.

The previous prime is 19557006883. The next prime is 19557006919. The reversal of 19557006913 is 31960075591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31960075591 = 3373 ⋅9475267.

It can be written as a sum of positive squares in 2 ways, for example, as 2726615089 + 16830391824 = 52217^2 + 129732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19557006913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19557006919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864018 + ... + 886363.

It is an arithmetic number, because the mean of its divisors is an integer number (4889692117).

Almost surely, 2^19557006913 is an apocalyptic number.

It is an amenable number.

19557006913 is a deficient number, since it is larger than the sum of its proper divisors (1761555).

19557006913 is a wasteful number, since it uses less digits than its factorization.

19557006913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761554.

The product of its (nonzero) digits is 255150, while the sum is 46.

The spelling of 19557006913 in words is "nineteen billion, five hundred fifty-seven million, six thousand, nine hundred thirteen".