665945376 has 48 divisors (see below), whose sum is σ = 1751095584. Its totient is φ = 221602304.

The previous prime is 665945353. The next prime is 665945389. The reversal of 665945376 is 673549566.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53611 + ... + 64853.

It is an arithmetic number, because the mean of its divisors is an integer number (36481158).

Almost surely, 2^665945376 is an apocalyptic number.

It is an amenable number.

665945376 is an abundant number, since it is smaller than the sum of its proper divisors (1085150208).

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

665945376 is a wasteful number, since it uses less digits than its factorization.

665945376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11873 (or 11865 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 51.

The square root of 665945376 is about 25805.9174609236. The cubic root of 665945376 is about 873.2652983278.

The spelling of 665945376 in words is "six hundred sixty-five million, nine hundred forty-five thousand, three hundred seventy-six".