616666604456 has 192 divisors, whose sum is σ = 1389044764800. Its totient is φ = 255794692608.

The previous prime is 616666604429. The next prime is 616666604471. The reversal of 616666604456 is 654406666616.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 695226845 + ... + 695227731.

It is an arithmetic number, because the mean of its divisors is an integer number (7234608150).

Almost surely, 2^616666604456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 616666604456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694522382400).

616666604456 is an abundant number, since it is smaller than the sum of its proper divisors (772378160344).

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

616666604456 is a wasteful number, since it uses less digits than its factorization.

616666604456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 56.

The spelling of 616666604456 in words is "six hundred sixteen billion, six hundred sixty-six million, six hundred four thousand, four hundred fifty-six".