665867604 has 36 divisors (see below), whose sum is σ = 1568297472. Its totient is φ = 219875040.

The previous prime is 665867603. The next prime is 665867663. The reversal of 665867604 is 406768566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665867603) 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, 1007034 + ... + 1007694.

Almost surely, 2^665867604 is an apocalyptic number.

It is an amenable number.

665867604 is an abundant number, since it is smaller than the sum of its proper divisors (902429868).

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

665867604 is a wasteful number, since it uses less digits than its factorization.

665867604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The square root of 665867604 is about 25804.4105532368. The cubic root of 665867604 is about 873.2313024300.

The spelling of 665867604 in words is "six hundred sixty-five million, eight hundred sixty-seven thousand, six hundred four".