16631591356 has 6 divisors (see below), whose sum is σ = 29105284880. Its totient is φ = 8315795676.

The previous prime is 16631591323. The next prime is 16631591381. The reversal of 16631591356 is 65319513661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2078948916 + ... + 2078948923.

Almost surely, 2^16631591356 is an apocalyptic number.

It is an amenable number.

16631591356 is a deficient number, since it is larger than the sum of its proper divisors (12473693524).

16631591356 is a wasteful number, since it uses less digits than its factorization.

16631591356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157897843 (or 4157897841 counting only the distinct ones).

The product of its digits is 437400, while the sum is 46.

The spelling of 16631591356 in words is "sixteen billion, six hundred thirty-one million, five hundred ninety-one thousand, three hundred fifty-six".