15997009972 has 12 divisors (see below), whose sum is σ = 27995683716. Its totient is φ = 7998243200.

The previous prime is 15997009969. The next prime is 15997009999. The reversal of 15997009972 is 27990079951.

15997009972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10317277476 + 5679732496 = 101574^2 + 75364^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153222 + ... + 235522.

It is an arithmetic number, because the mean of its divisors is an integer number (2332973643).

Almost surely, 2^15997009972 is an apocalyptic number.

It is an amenable number.

15997009972 is a deficient number, since it is larger than the sum of its proper divisors (11998673744).

15997009972 is a wasteful number, since it uses less digits than its factorization.

15997009972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130898 (or 130896 counting only the distinct ones).

The product of its (nonzero) digits is 3214890, while the sum is 58.

The spelling of 15997009972 in words is "fifteen billion, nine hundred ninety-seven million, nine thousand, nine hundred seventy-two".