664899453 has 12 divisors (see below), whose sum is σ = 960695580. Its totient is φ = 443134656.

The previous prime is 664899437. The next prime is 664899467. The reversal of 664899453 is 354998466.

664899453 is a `hidden beast` number, since 66 + 48 + 99 + 453 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 319051044 + 345848409 = 17862^2 + 18597^2 .

It is not a de Polignac number, because 664899453 - 2⁴ = 664899437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664899453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664899413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28483 + ... + 46271.

It is an arithmetic number, because the mean of its divisors is an integer number (80057965).

Almost surely, 2^664899453 is an apocalyptic number.

It is an amenable number.

664899453 is a deficient number, since it is larger than the sum of its proper divisors (295796127).

664899453 is a wasteful number, since it uses less digits than its factorization.

664899453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21948 (or 21945 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 664899453 is about 25785.6443200475. The cubic root of 664899453 is about 872.8078800044.

The spelling of 664899453 in words is "six hundred sixty-four million, eight hundred ninety-nine thousand, four hundred fifty-three".