61388752558878 has 24 divisors (see below), whose sum is σ = 136102195597368. Its totient is φ = 19987035716592.

The previous prime is 61388752558871. The next prime is 61388752558961. The reversal of 61388752558878 is 87885525788316.

61388752558878 is a `hidden beast` number, since 6 + 1 + 3 + 8 + 8 + 7 + 5 + 25 + 588 + 7 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 61388752558797 and 61388752558806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61388752558871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39656816125 + ... + 39656817672.

It is an arithmetic number, because the mean of its divisors is an integer number (5670924816557).

Almost surely, 2^{61388752558878} is an apocalyptic number.

61388752558878 is an abundant number, since it is smaller than the sum of its proper divisors (74713443038490).

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

61388752558878 is a wasteful number, since it uses less digits than its factorization.

61388752558878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79313633848 (or 79313633845 counting only the distinct ones).

The product of its digits is 7225344000, while the sum is 81.

The spelling of 61388752558878 in words is "sixty-one trillion, three hundred eighty-eight billion, seven hundred fifty-two million, five hundred fifty-eight thousand, eight hundred seventy-eight".