19642745979 has 12 divisors (see below), whose sum is σ = 28691652600. Its totient is φ = 12948026784.

The previous prime is 19642745963. The next prime is 19642745987. The reversal of 19642745979 is 97954724691.

19642745979 is a `hidden beast` number, since 1 + 96 + 4 + 27 + 459 + 79 = 666.

It is not a de Polignac number, because 19642745979 - 2⁴ = 19642745963 is a prime.

It is a super-3 number, since 3×19642745979³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19642745279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12260589 + ... + 12262190.

It is an arithmetic number, because the mean of its divisors is an integer number (2390971050).

Almost surely, 2^19642745979 is an apocalyptic number.

19642745979 is a deficient number, since it is larger than the sum of its proper divisors (9048906621).

19642745979 is a wasteful number, since it uses less digits than its factorization.

19642745979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24522874 (or 24522871 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 19642745979 in words is "nineteen billion, six hundred forty-two million, seven hundred forty-five thousand, nine hundred seventy-nine".