16656561240 has 384 divisors, whose sum is σ = 59203353600. Its totient is φ = 3715563520.

The previous prime is 16656561239. The next prime is 16656561253. The reversal of 16656561240 is 4216565661.

It is a junction number, because it is equal to n+sod(n) for n = 16656561192 and 16656561201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17929096 + ... + 17930024.

It is an arithmetic number, because the mean of its divisors is an integer number (154175400).

Almost surely, 2^16656561240 is an apocalyptic number.

16656561240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16656561240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29601676800).

16656561240 is an abundant number, since it is smaller than the sum of its proper divisors (42546792360).

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

16656561240 is a wasteful number, since it uses less digits than its factorization.

16656561240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 16656561240 in words is "sixteen billion, six hundred fifty-six million, five hundred sixty-one thousand, two hundred forty".