661372966 has 8 divisors (see below), whose sum is σ = 1002287160. Its totient is φ = 327277248.

The previous prime is 661372963. The next prime is 661372969. The reversal of 661372966 is 669273166.

It is an interprime number because it is at equal distance from previous prime (661372963) and next prime (661372969).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661372963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1704376 + ... + 1704763.

It is an arithmetic number, because the mean of its divisors is an integer number (125285895).

Almost surely, 2^661372966 is an apocalyptic number.

661372966 is a deficient number, since it is larger than the sum of its proper divisors (340914194).

661372966 is a wasteful number, since it uses less digits than its factorization.

661372966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409238.

The product of its digits is 489888, while the sum is 46.

The square root of 661372966 is about 25717.1725895364. The cubic root of 661372966 is about 871.2620807052.

The spelling of 661372966 in words is "six hundred sixty-one million, three hundred seventy-two thousand, nine hundred sixty-six".