15986637979 has 12 divisors (see below), whose sum is σ = 17569360056. Its totient is φ = 14536634112.

The previous prime is 15986637977. The next prime is 15986637983. The reversal of 15986637979 is 97973668951.

It is not a de Polignac number, because 15986637979 - 2¹ = 15986637977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15986637971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 694614 + ... + 717259.

It is an arithmetic number, because the mean of its divisors is an integer number (1464113338).

Almost surely, 2^15986637979 is an apocalyptic number.

15986637979 is a deficient number, since it is larger than the sum of its proper divisors (1582722077).

15986637979 is a wasteful number, since it uses less digits than its factorization.

15986637979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411966 (or 1411953 counting only the distinct ones).

The product of its digits is 154314720, while the sum is 70.

The spelling of 15986637979 in words is "fifteen billion, nine hundred eighty-six million, six hundred thirty-seven thousand, nine hundred seventy-nine".