76557578616 has 96 divisors (see below), whose sum is σ = 215292168000. Its totient is φ = 24547444992.

The previous prime is 76557578563. The next prime is 76557578621. The reversal of 76557578616 is 61687575567.

76557578616 is a `hidden beast` number, since 7 + 6 + 5 + 5 + 7 + 5 + 7 + 8 + 616 = 666.

It is a super-2 number, since 2×76557578616² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 493521 + ... + 629823.

It is an arithmetic number, because the mean of its divisors is an integer number (2242626750).

Almost surely, 2^76557578616 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 76557578616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107646084000).

76557578616 is an abundant number, since it is smaller than the sum of its proper divisors (138734589384).

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

76557578616 is a wasteful number, since it uses less digits than its factorization.

76557578616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136613 (or 136606 counting only the distinct ones).

The product of its digits is 74088000, while the sum is 63.

The spelling of 76557578616 in words is "seventy-six billion, five hundred fifty-seven million, five hundred seventy-eight thousand, six hundred sixteen".