19879372809 has 32 divisors (see below), whose sum is σ = 29694537600. Its totient is φ = 13143695040.

The previous prime is 19879372787. The next prime is 19879372831. The reversal of 19879372809 is 90827397891.

19879372809 is a `hidden beast` number, since 198 + 79 + 372 + 8 + 0 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (19879372787) and next prime (19879372831).

It is not a de Polignac number, because 19879372809 - 2¹¹ = 19879370761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19879372859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1846807 + ... + 1857539.

It is an arithmetic number, because the mean of its divisors is an integer number (927954300).

Almost surely, 2^19879372809 is an apocalyptic number.

It is an amenable number.

19879372809 is a deficient number, since it is larger than the sum of its proper divisors (9815164791).

19879372809 is a wasteful number, since it uses less digits than its factorization.

19879372809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11302 (or 11296 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 63.

The spelling of 19879372809 in words is "nineteen billion, eight hundred seventy-nine million, three hundred seventy-two thousand, eight hundred nine".