61425836136 has 320 divisors, whose sum is σ = 207467568000. Its totient is φ = 16587141120.

The previous prime is 61425836113. The next prime is 61425836137. The reversal of 61425836136 is 63163852416.

61425836136 is a `hidden beast` number, since 6 + 1 + 4 + 2 + 583 + 61 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 61425836091 and 61425836100.

It is not an unprimeable number, because it can be changed into a prime (61425836137) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 69722416 + ... + 69723296.

It is an arithmetic number, because the mean of its divisors is an integer number (648336150).

Almost surely, 2^61425836136 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 61425836136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103733784000).

61425836136 is an abundant number, since it is smaller than the sum of its proper divisors (146041731864).

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

61425836136 is a wasteful number, since it uses less digits than its factorization.

61425836136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734 (or 1721 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 61425836136 in words is "sixty-one billion, four hundred twenty-five million, eight hundred thirty-six thousand, one hundred thirty-six".