61313787564 has 48 divisors (see below), whose sum is σ = 144525282048. Its totient is φ = 20229715008.

The previous prime is 61313787559. The next prime is 61313787641. The reversal of 61313787564 is 46578731316.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1537809 + ... + 1577175.

It is an arithmetic number, because the mean of its divisors is an integer number (3010943376).

Almost surely, 2^61313787564 is an apocalyptic number.

It is an amenable number.

61313787564 is an abundant number, since it is smaller than the sum of its proper divisors (83211494484).

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

61313787564 is a wasteful number, since it uses less digits than its factorization.

61313787564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40694 (or 40692 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The spelling of 61313787564 in words is "sixty-one billion, three hundred thirteen million, seven hundred eighty-seven thousand, five hundred sixty-four".