15972245971 has 32 divisors (see below), whose sum is σ = 18852433920. Its totient is φ = 13380681600.

The previous prime is 15972245881. The next prime is 15972246001. The reversal of 15972245971 is 17954227951.

It is not a de Polignac number, because 15972245971 - 2¹³ = 15972237779 is a prime.

It is a super-2 number, since 2×15972245971² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (15972245071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1791601 + ... + 1800493.

It is an arithmetic number, because the mean of its divisors is an integer number (589138560).

Almost surely, 2^15972245971 is an apocalyptic number.

15972245971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15972245971 is a deficient number, since it is larger than the sum of its proper divisors (2880187949).

15972245971 is a wasteful number, since it uses less digits than its factorization.

15972245971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9187.

The product of its digits is 1587600, while the sum is 52.

The spelling of 15972245971 in words is "fifteen billion, nine hundred seventy-two million, two hundred forty-five thousand, nine hundred seventy-one".