61722725620866 has 16 divisors (see below), whose sum is σ = 124718084760864. Its totient is φ = 20362136287104.

The previous prime is 61722725620849. The next prime is 61722725620891. The reversal of 61722725620866 is 66802652722716.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53026396000 + ... + 53026397163.

It is an arithmetic number, because the mean of its divisors is an integer number (7794880297554).

Almost surely, 2^{61722725620866} is an apocalyptic number.

61722725620866 is an abundant number, since it is smaller than the sum of its proper divisors (62995359139998).

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

61722725620866 is a wasteful number, since it uses less digits than its factorization.

61722725620866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106052793265.

The product of its (nonzero) digits is 40642560, while the sum is 60.

The spelling of 61722725620866 in words is "sixty-one trillion, seven hundred twenty-two billion, seven hundred twenty-five million, six hundred twenty thousand, eight hundred sixty-six".