15991249196836 has 27 divisors (see below), whose sum is σ = 28201788089083. Its totient is φ = 7934069438360.

The previous prime is 15991249196777. The next prime is 15991249196891. The reversal of 15991249196836 is 63869194219951.

The square root of 15991249196836 is 3998906.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1047705741 + ... + 1047721003.

Almost surely, 2^{15991249196836} is an apocalyptic number.

15991249196836 is the 3998906-th square number.

It is an amenable number.

15991249196836 is a deficient number, since it is larger than the sum of its proper divisors (12210538892247).

15991249196836 is an frugal number, since it uses more digits than its factorization.

15991249196836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30792 (or 15396 counting only the distinct ones).

The product of its digits is 226748160, while the sum is 73.

The spelling of 15991249196836 in words is "fifteen trillion, nine hundred ninety-one billion, two hundred forty-nine million, one hundred ninety-six thousand, eight hundred thirty-six".