16321351646 has 4 divisors (see below), whose sum is σ = 24482027472. Its totient is φ = 8160675822.

The previous prime is 16321351567. The next prime is 16321351663. The reversal of 16321351646 is 64615312361.

It is a semiprime because it is the product of two primes.

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, 4080337910 + ... + 4080337913.

It is an arithmetic number, because the mean of its divisors is an integer number (6120506868).

Almost surely, 2^16321351646 is an apocalyptic number.

16321351646 is a deficient number, since it is larger than the sum of its proper divisors (8160675826).

16321351646 is an equidigital number, since it uses as much as digits as its factorization.

16321351646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8160675825.

The product of its digits is 77760, while the sum is 38.

The spelling of 16321351646 in words is "sixteen billion, three hundred twenty-one million, three hundred fifty-one thousand, six hundred forty-six".