16656178440 has 64 divisors (see below), whose sum is σ = 54511133760. Its totient is φ = 4037861120.

The previous prime is 16656178421. The next prime is 16656178447. The reversal of 16656178440 is 4487165661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16656178440.

It is not an unprimeable number, because it can be changed into a prime (16656178447) 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, 6307839 + ... + 6310478.

It is an arithmetic number, because the mean of its divisors is an integer number (851736465).

Almost surely, 2^16656178440 is an apocalyptic number.

16656178440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16656178440 is an abundant number, since it is smaller than the sum of its proper divisors (37854955320).

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

16656178440 is a wasteful number, since it uses less digits than its factorization.

16656178440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12618342 (or 12618338 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 16656178440 in words is "sixteen billion, six hundred fifty-six million, one hundred seventy-eight thousand, four hundred forty".