613978999056 has 160 divisors (see below), whose sum is σ = 1809798451200. Its totient is φ = 199222208640.

The previous prime is 613978999043. The next prime is 613978999063. The reversal of 613978999056 is 650999879316.

613978999056 is a `hidden beast` number, since 61 + 397 + 8 + 99 + 90 + 5 + 6 = 666.

It is a super-2 number, since 2×613978999056² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 2296395 + ... + 2549781.

It is an arithmetic number, because the mean of its divisors is an integer number (11311240320).

Almost surely, 2^613978999056 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 613978999056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904899225600).

613978999056 is an abundant number, since it is smaller than the sum of its proper divisors (1195819452144).

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

613978999056 is a wasteful number, since it uses less digits than its factorization.

613978999056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253554 (or 253542 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 72.

The spelling of 613978999056 in words is "six hundred thirteen billion, nine hundred seventy-eight million, nine hundred ninety-nine thousand, fifty-six".