665902965 has 64 divisors (see below), whose sum is σ = 1329979392. Its totient is φ = 276998400.

The previous prime is 665902961. The next prime is 665902967. The reversal of 665902965 is 569209566.

It is not a de Polignac number, because 665902965 - 2² = 665902961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665902961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 93480 + ... + 100350.

It is an arithmetic number, because the mean of its divisors is an integer number (20780928).

Almost surely, 2^665902965 is an apocalyptic number.

665902965 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

665902965 is a deficient number, since it is larger than the sum of its proper divisors (664076427).

665902965 is a wasteful number, since it uses less digits than its factorization.

665902965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6970.

The product of its (nonzero) digits is 874800, while the sum is 48.

The square root of 665902965 is about 25805.0957177066. The cubic root of 665902965 is about 873.2467598499.

The spelling of 665902965 in words is "six hundred sixty-five million, nine hundred two thousand, nine hundred sixty-five".