15997479951 has 32 divisors (see below), whose sum is σ = 23101689600. Its totient is φ = 9812586240.

The previous prime is 15997479941. The next prime is 15997479959.

It is a happy number.

15997479951 is nontrivially palindromic in base 10.

15997479951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15997479951 - 2⁹ = 15997479439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997479959) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1193356 + ... + 1206686.

It is an arithmetic number, because the mean of its divisors is an integer number (721927800).

Almost surely, 2^15997479951 is an apocalyptic number.

15997479951 is a deficient number, since it is larger than the sum of its proper divisors (7104209649).

15997479951 is a wasteful number, since it uses less digits than its factorization.

15997479951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13959.

The product of its digits is 32148900, while the sum is 66.

The spelling of 15997479951 in words is "fifteen billion, nine hundred ninety-seven million, four hundred seventy-nine thousand, nine hundred fifty-one".