61766242064 has 20 divisors (see below), whose sum is σ = 123798718860. Its totient is φ = 29818185600.

The previous prime is 61766242007. The next prime is 61766242133. The reversal of 61766242064 is 46024266716.

It can be written as a sum of positive squares in 2 ways, for example, as 31173433600 + 30592808464 = 176560^2 + 174908^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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, 66557987 + ... + 66558914.

It is an arithmetic number, because the mean of its divisors is an integer number (6189935943).

Almost surely, 2^61766242064 is an apocalyptic number.

It is an amenable number.

61766242064 is an abundant number, since it is smaller than the sum of its proper divisors (62032476796).

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

61766242064 is a wasteful number, since it uses less digits than its factorization.

61766242064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133116938 (or 133116932 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 61766242064 in words is "sixty-one billion, seven hundred sixty-six million, two hundred forty-two thousand, sixty-four".