61439713736 has 128 divisors (see below), whose sum is σ = 131964940800. Its totient is φ = 26635392000.

The previous prime is 61439713733. The next prime is 61439713739. The reversal of 61439713736 is 63731793416.

It is an interprime number because it is at equal distance from previous prime (61439713733) and next prime (61439713739).

It is not an unprimeable number, because it can be changed into a prime (61439713733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27888011 + ... + 27890213.

It is an arithmetic number, because the mean of its divisors is an integer number (1030976100).

Almost surely, 2^61439713736 is an apocalyptic number.

It is an amenable number.

61439713736 is an abundant number, since it is smaller than the sum of its proper divisors (70525227064).

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

61439713736 is a wasteful number, since it uses less digits than its factorization.

61439713736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539 (or 2535 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 50.

The spelling of 61439713736 in words is "sixty-one billion, four hundred thirty-nine million, seven hundred thirteen thousand, seven hundred thirty-six".