15986318397 has 32 divisors (see below), whose sum is σ = 24848052480. Its totient is φ = 8952453120.

The previous prime is 15986318333. The next prime is 15986318431. The reversal of 15986318397 is 79381368951.

It is not a de Polignac number, because 15986318397 - 2⁶ = 15986318333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15986318397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15986318317) 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, 1026247 + ... + 1041707.

It is an arithmetic number, because the mean of its divisors is an integer number (776501640).

Almost surely, 2^15986318397 is an apocalyptic number.

It is an amenable number.

15986318397 is a deficient number, since it is larger than the sum of its proper divisors (8861734083).

15986318397 is a wasteful number, since it uses less digits than its factorization.

15986318397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16453.

The product of its digits is 9797760, while the sum is 60.

The spelling of 15986318397 in words is "fifteen billion, nine hundred eighty-six million, three hundred eighteen thousand, three hundred ninety-seven".