661360245624 has 160 divisors (see below), whose sum is σ = 2081651029920. Its totient is φ = 194647774464.

The previous prime is 661360245613. The next prime is 661360245709. The reversal of 661360245624 is 426542063166.

It is a happy number.

661360245624 is a `hidden beast` number, since 6 + 6 + 1 + 3 + 60 + 24 + 562 + 4 = 666.

It is a super-2 number, since 2×661360245624² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661360245624.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1512967 + ... + 1900470.

It is an arithmetic number, because the mean of its divisors is an integer number (13010318937).

Almost surely, 2^661360245624 is an apocalyptic number.

It is an amenable number.

661360245624 is an abundant number, since it is smaller than the sum of its proper divisors (1420290784296).

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

661360245624 is a wasteful number, since it uses less digits than its factorization.

661360245624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413491 (or 3413478 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 661360245624 in words is "six hundred sixty-one billion, three hundred sixty million, two hundred forty-five thousand, six hundred twenty-four".