665915460 has 48 divisors (see below), whose sum is σ = 2130930816. Its totient is φ = 152209152.

The previous prime is 665915431. The next prime is 665915519. The reversal of 665915460 is 64519566.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792337 + ... + 793176.

It is an arithmetic number, because the mean of its divisors is an integer number (44394392).

Almost surely, 2^665915460 is an apocalyptic number.

665915460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665915460 is an abundant number, since it is smaller than the sum of its proper divisors (1465015356).

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

665915460 is a wasteful number, since it uses less digits than its factorization.

665915460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585532 (or 1585530 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 665915460 is about 25805.3378199163. The cubic root of 665915460 is about 873.2522216817.

The spelling of 665915460 in words is "six hundred sixty-five million, nine hundred fifteen thousand, four hundred sixty".