19979522658 has 24 divisors (see below), whose sum is σ = 43316652288. Its totient is φ = 6655581432.

The previous prime is 19979522639. The next prime is 19979522659. The reversal of 19979522658 is 85622597991.

19979522658 is a `hidden beast` number, since 19 + 97 + 9 + 522 + 6 + 5 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19979522595 and 19979522604.

It is not an unprimeable number, because it can be changed into a prime (19979522659) 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, 325966 + ... + 382377.

It is an arithmetic number, because the mean of its divisors is an integer number (1804860512).

Almost surely, 2^19979522658 is an apocalyptic number.

19979522658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19979522658 is an abundant number, since it is smaller than the sum of its proper divisors (23337129630).

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

19979522658 is a wasteful number, since it uses less digits than its factorization.

19979522658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709918 (or 709915 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 63.

The spelling of 19979522658 in words is "nineteen billion, nine hundred seventy-nine million, five hundred twenty-two thousand, six hundred fifty-eight".