16396563646 has 8 divisors (see below), whose sum is σ = 25889311080. Its totient is φ = 7766793288.

The previous prime is 16396563613. The next prime is 16396563671. The reversal of 16396563646 is 64636569361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215744221 + ... + 215744296.

It is an arithmetic number, because the mean of its divisors is an integer number (3236163885).

Almost surely, 2^16396563646 is an apocalyptic number.

16396563646 is a deficient number, since it is larger than the sum of its proper divisors (9492747434).

16396563646 is a wasteful number, since it uses less digits than its factorization.

16396563646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431488538.

The product of its digits is 12597120, while the sum is 55.

The spelling of 16396563646 in words is "sixteen billion, three hundred ninety-six million, five hundred sixty-three thousand, six hundred forty-six".