661830957 has 12 divisors (see below), whose sum is σ = 997542624. Its totient is φ = 422037000.

The previous prime is 661830941. The next prime is 661830977. The reversal of 661830957 is 759038166.

It is a happy number.

It is not a de Polignac number, because 661830957 - 2⁴ = 661830941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661830977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1598419 + ... + 1598832.

It is an arithmetic number, because the mean of its divisors is an integer number (83128552).

Almost surely, 2^661830957 is an apocalyptic number.

It is an amenable number.

661830957 is a deficient number, since it is larger than the sum of its proper divisors (335711667).

661830957 is a wasteful number, since it uses less digits than its factorization.

661830957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197280 (or 3197277 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 661830957 is about 25726.0754294160. The cubic root of 661830957 is about 871.4631463368.

The spelling of 661830957 in words is "six hundred sixty-one million, eight hundred thirty thousand, nine hundred fifty-seven".