19972552139 has 4 divisors (see below), whose sum is σ = 19981204320. Its totient is φ = 19963899960.

The previous prime is 19972552123. The next prime is 19972552163. The reversal of 19972552139 is 93125527991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93125527991 = 124199 ⋅749809.

It is a cyclic number.

It is not a de Polignac number, because 19972552139 - 2⁴ = 19972552123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19972552189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4322627 + ... + 4327244.

It is an arithmetic number, because the mean of its divisors is an integer number (4995301080).

Almost surely, 2^19972552139 is an apocalyptic number.

19972552139 is a deficient number, since it is larger than the sum of its proper divisors (8652181).

19972552139 is an equidigital number, since it uses as much as digits as its factorization.

19972552139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8652180.

The product of its digits is 1530900, while the sum is 53.

The spelling of 19972552139 in words is "nineteen billion, nine hundred seventy-two million, five hundred fifty-two thousand, one hundred thirty-nine".