15972245881 has 2 divisors, whose sum is σ = 15972245882. Its totient is φ = 15972245880.

The previous prime is 15972245831. The next prime is 15972246001. The reversal of 15972245881 is 18854227951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10832646400 + 5139599481 = 104080^2 + 71691^2 .

It is a cyclic number.

It is not a de Polignac number, because 15972245881 - 2⁹ = 15972245369 is a prime.

It is a super-2 number, since 2×15972245881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15972245831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7986122940 + 7986122941.

It is an arithmetic number, because the mean of its divisors is an integer number (7986122941).

Almost surely, 2^15972245881 is an apocalyptic number.

It is an amenable number.

15972245881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15972245881 is an equidigital number, since it uses as much as digits as its factorization.

15972245881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 52.

The spelling of 15972245881 in words is "fifteen billion, nine hundred seventy-two million, two hundred forty-five thousand, eight hundred eighty-one".