19902872479 has 6 divisors (see below), whose sum is σ = 23152321104. Its totient is φ = 17059604940.

The previous prime is 19902872471. The next prime is 19902872489. The reversal of 19902872479 is 97427820991.

It is not a de Polignac number, because 19902872479 - 2³ = 19902872471 is a prime.

It is a super-2 number, since 2×19902872479² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19902872471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203090487 + ... + 203090584.

It is an arithmetic number, because the mean of its divisors is an integer number (3858720184).

Almost surely, 2^19902872479 is an apocalyptic number.

19902872479 is a deficient number, since it is larger than the sum of its proper divisors (3249448625).

19902872479 is an equidigital number, since it uses as much as digits as its factorization.

19902872479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406181085 (or 406181078 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 19902872479 in words is "nineteen billion, nine hundred two million, eight hundred seventy-two thousand, four hundred seventy-nine".