665451963 has 48 divisors (see below), whose sum is σ = 1088599680. Its totient is φ = 401456880.

The previous prime is 665451937. The next prime is 665451967. The reversal of 665451963 is 369154566.

It is not a de Polignac number, because 665451963 - 2⁸ = 665451707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665451967) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1133356 + ... + 1133942.

It is an arithmetic number, because the mean of its divisors is an integer number (22679160).

Almost surely, 2^665451963 is an apocalyptic number.

665451963 is a deficient number, since it is larger than the sum of its proper divisors (423147717).

665451963 is a wasteful number, since it uses less digits than its factorization.

665451963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 948 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 665451963 is about 25796.3556146988. The cubic root of 665451963 is about 873.0495714698.

The spelling of 665451963 in words is "six hundred sixty-five million, four hundred fifty-one thousand, nine hundred sixty-three".