16656247640 has 64 divisors (see below), whose sum is σ = 39747188160. Its totient is φ = 6268331520.

The previous prime is 16656247633. The next prime is 16656247649. The reversal of 16656247640 is 4674265661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656247649) 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, 92279 + ... + 204518.

It is an arithmetic number, because the mean of its divisors is an integer number (621049815).

Almost surely, 2^16656247640 is an apocalyptic number.

16656247640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16656247640 is an abundant number, since it is smaller than the sum of its proper divisors (23090940520).

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

16656247640 is a wasteful number, since it uses less digits than its factorization.

16656247640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296892 (or 296888 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 16656247640 in words is "sixteen billion, six hundred fifty-six million, two hundred forty-seven thousand, six hundred forty".