665401612 has 12 divisors (see below), whose sum is σ = 1170887536. Its totient is φ = 330862320.

The previous prime is 665401609. The next prime is 665401613. The reversal of 665401612 is 216104566.

It is not an unprimeable number, because it can be changed into a prime (665401613) 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, 458808 + ... + 460255.

Almost surely, 2^665401612 is an apocalyptic number.

It is an amenable number.

665401612 is a deficient number, since it is larger than the sum of its proper divisors (505485924).

665401612 is a wasteful number, since it uses less digits than its factorization.

665401612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919248 (or 919246 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 665401612 is about 25795.3796638080. The cubic root of 665401612 is about 873.0275513340.

The spelling of 665401612 in words is "six hundred sixty-five million, four hundred one thousand, six hundred twelve".