665140800 has 84 divisors (see below), whose sum is σ = 2182231856. Its totient is φ = 177369600.

The previous prime is 665140799. The next prime is 665140811. The reversal of 665140800 is 8041566.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64486 + ... + 74085.

Almost surely, 2^665140800 is an apocalyptic number.

665140800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665140800 is an abundant number, since it is smaller than the sum of its proper divisors (1517091056).

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

665140800 is a wasteful number, since it uses less digits than its factorization.

665140800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138596 (or 138581 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 665140800 is about 25790.3237668704. The cubic root of 665140800 is about 872.9134719503.

The spelling of 665140800 in words is "six hundred sixty-five million, one hundred forty thousand, eight hundred".