16656443642 has 16 divisors (see below), whose sum is σ = 25072092864. Its totient is φ = 8299104000.

The previous prime is 16656443611. The next prime is 16656443677. The reversal of 16656443642 is 24634465661.

It is a super-2 number, since 2×16656443642² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1790042 + ... + 1799322.

It is an arithmetic number, because the mean of its divisors is an integer number (1567005804).

Almost surely, 2^16656443642 is an apocalyptic number.

16656443642 is a deficient number, since it is larger than the sum of its proper divisors (8415649222).

16656443642 is a wasteful number, since it uses less digits than its factorization.

16656443642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12325.

The product of its digits is 2488320, while the sum is 47.

The spelling of 16656443642 in words is "sixteen billion, six hundred fifty-six million, four hundred forty-three thousand, six hundred forty-two".