16451644556 has 12 divisors (see below), whose sum is σ = 28819261968. Its totient is φ = 8217569712.

The previous prime is 16451644553. The next prime is 16451644579. The reversal of 16451644556 is 65544615461.

It is a self number, because there is not a number n which added to its sum of digits gives 16451644556.

It is not an unprimeable number, because it can be changed into a prime (16451644553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2058656 + ... + 2066631.

It is an arithmetic number, because the mean of its divisors is an integer number (2401605164).

Almost surely, 2^16451644556 is an apocalyptic number.

It is an amenable number.

16451644556 is a deficient number, since it is larger than the sum of its proper divisors (12367617412).

16451644556 is a wasteful number, since it uses less digits than its factorization.

16451644556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4126288 (or 4126286 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 47.

The spelling of 16451644556 in words is "sixteen billion, four hundred fifty-one million, six hundred forty-four thousand, five hundred fifty-six".