616685723136 has 320 divisors, whose sum is σ = 2114811072000. Its totient is φ = 173780287488.

The previous prime is 616685723113. The next prime is 616685723153. The reversal of 616685723136 is 631327586616.

616685723136 is a `hidden beast` number, since 6 + 1 + 6 + 6 + 8 + 572 + 31 + 36 = 666.

It is a super-2 number, since 2×616685723136² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7020415 + ... + 7107713.

It is an arithmetic number, because the mean of its divisors is an integer number (6608784600).

Almost surely, 2^616685723136 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 616685723136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057405536000).

616685723136 is an abundant number, since it is smaller than the sum of its proper divisors (1498125348864).

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

616685723136 is an equidigital number, since it uses as much as digits as its factorization.

616685723136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87406 (or 87384 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 616685723136 in words is "six hundred sixteen billion, six hundred eighty-five million, seven hundred twenty-three thousand, one hundred thirty-six".