665432901 has 96 divisors (see below), whose sum is σ = 1192871680. Its totient is φ = 362797056.

The previous prime is 665432891. The next prime is 665432903. The reversal of 665432901 is 109234566.

It is a happy number.

It is not a de Polignac number, because 665432901 - 2⁶ = 665432837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665432903) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6104835 + ... + 6104943.

Almost surely, 2^665432901 is an apocalyptic number.

It is an amenable number.

665432901 is a deficient number, since it is larger than the sum of its proper divisors (527438779).

665432901 is a wasteful number, since it uses less digits than its factorization.

665432901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 665432901 is about 25795.9861412585. The cubic root of 665432901 is about 873.0412351657.

The spelling of 665432901 in words is "six hundred sixty-five million, four hundred thirty-two thousand, nine hundred one".