61561015662 has 32 divisors (see below), whose sum is σ = 124455082752. Its totient is φ = 20298380544.

The previous prime is 61561015639. The next prime is 61561015679. The reversal of 61561015662 is 26651016516.

It is a self number, because there is not a number n which added to its sum of digits gives 61561015662.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1153623 + ... + 1205805.

It is an arithmetic number, because the mean of its divisors is an integer number (3889221336).

Almost surely, 2^61561015662 is an apocalyptic number.

61561015662 is an abundant number, since it is smaller than the sum of its proper divisors (62894067090).

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

61561015662 is a wasteful number, since it uses less digits than its factorization.

61561015662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54312.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 61561015662 in words is "sixty-one billion, five hundred sixty-one million, fifteen thousand, six hundred sixty-two".