16656081772 has 48 divisors (see below), whose sum is σ = 34074214272. Its totient is φ = 7039719680.

The previous prime is 16656081737. The next prime is 16656081779. The reversal of 16656081772 is 27718065661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16656081779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72058 + ... + 196225.

It is an arithmetic number, because the mean of its divisors is an integer number (709879464).

Almost surely, 2^16656081772 is an apocalyptic number.

It is an amenable number.

16656081772 is an abundant number, since it is smaller than the sum of its proper divisors (17418132500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16656081772 is a wasteful number, since it uses less digits than its factorization.

16656081772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268398 (or 268396 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 16656081772 in words is "sixteen billion, six hundred fifty-six million, eighty-one thousand, seven hundred seventy-two".