19979786725 has 12 divisors (see below), whose sum is σ = 24782494176. Its totient is φ = 15978952880.

The previous prime is 19979786693. The next prime is 19979786789. The reversal of 19979786725 is 52768797991.

It is not a de Polignac number, because 19979786725 - 2⁵ = 19979786693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37177 + ... + 203326.

It is an arithmetic number, because the mean of its divisors is an integer number (2065207848).

Almost surely, 2^19979786725 is an apocalyptic number.

It is an amenable number.

19979786725 is a deficient number, since it is larger than the sum of its proper divisors (4802707451).

19979786725 is a wasteful number, since it uses less digits than its factorization.

19979786725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243836 (or 243831 counting only the distinct ones).

The product of its digits is 120022560, while the sum is 70.

The spelling of 19979786725 in words is "nineteen billion, nine hundred seventy-nine million, seven hundred eighty-six thousand, seven hundred twenty-five".