665499456 has 56 divisors (see below), whose sum is σ = 1956450240. Its totient is φ = 221832576.

The previous prime is 665499451. The next prime is 665499469. The reversal of 665499456 is 654994566.

665499456 is a `hidden beast` number, since 6 + 6 + 549 + 94 + 5 + 6 = 666.

665499456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665499451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190836 + ... + 194291.

Almost surely, 2^665499456 is an apocalyptic number.

It is an amenable number.

665499456 is an abundant number, since it is smaller than the sum of its proper divisors (1290950784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665499456 is a wasteful number, since it uses less digits than its factorization.

665499456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385148 (or 385132 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The square root of 665499456 is about 25797.2761352822. The cubic root of 665499456 is about 873.0703406909.

It can be divided in two parts, 66549945 and 6, that multiplied together give a triangular number (399299670 = T₂₈₂₅₉).

The spelling of 665499456 in words is "six hundred sixty-five million, four hundred ninety-nine thousand, four hundred fifty-six".