19724270658 has 16 divisors (see below), whose sum is σ = 39572988480. Its totient is φ = 6554015696.

The previous prime is 19724270647. The next prime is 19724270663. The reversal of 19724270658 is 85607242791.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19724270658.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5183238 + ... + 5187041.

It is an arithmetic number, because the mean of its divisors is an integer number (2473311780).

Almost surely, 2^19724270658 is an apocalyptic number.

19724270658 is an abundant number, since it is smaller than the sum of its proper divisors (19848717822).

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

19724270658 is a wasteful number, since it uses less digits than its factorization.

19724270658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10370601.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 19724270658 in words is "nineteen billion, seven hundred twenty-four million, two hundred seventy thousand, six hundred fifty-eight".