61147566736 has 20 divisors (see below), whose sum is σ = 122558701500. Its totient is φ = 29519514752.

The previous prime is 61147566721. The next prime is 61147566769. The reversal of 61147566736 is 63766574116.

61147566736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 34856890000 + 26290676736 = 186700^2 + 162144^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65891311 + ... + 65892238.

It is an arithmetic number, because the mean of its divisors is an integer number (6127935075).

Almost surely, 2^61147566736 is an apocalyptic number.

It is an amenable number.

61147566736 is an abundant number, since it is smaller than the sum of its proper divisors (61411134764).

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

61147566736 is a wasteful number, since it uses less digits than its factorization.

61147566736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131783586 (or 131783580 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 52.

The spelling of 61147566736 in words is "sixty-one billion, one hundred forty-seven million, five hundred sixty-six thousand, seven hundred thirty-six".