661107572630 has 16 divisors (see below), whose sum is σ = 1228380522624. Its totient is φ = 255912608640.

The previous prime is 661107572617. The next prime is 661107572633. The reversal of 661107572630 is 36275701166.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661107572633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1066302227 + ... + 1066302846.

It is an arithmetic number, because the mean of its divisors is an integer number (76773782664).

Almost surely, 2^661107572630 is an apocalyptic number.

661107572630 is a deficient number, since it is larger than the sum of its proper divisors (567272949994).

661107572630 is a wasteful number, since it uses less digits than its factorization.

661107572630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132605111.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 661107572630 in words is "six hundred sixty-one billion, one hundred seven million, five hundred seventy-two thousand, six hundred thirty".