665457 has 16 divisors (see below), whose sum is σ = 970368. Its totient is φ = 403200.

The previous prime is 665447. The next prime is 665479. The reversal of 665457 is 754566.

665457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665457 - 2⁸ = 665201 is a prime.

Its product of digits (25200) is a multiple of the sum of its prime divisors (280).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4332 + ... + 4482.

It is an arithmetic number, because the mean of its divisors is an integer number (60648).

2⁶⁶⁵⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

665457 is a deficient number, since it is larger than the sum of its proper divisors (304911).

665457 is a wasteful number, since it uses less digits than its factorization.

665457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280.

The product of its digits is 25200, while the sum is 33.

The square root of 665457 is about 815.7554780693. The cubic root of 665457 is about 87.3051774253.

The spelling of 665457 in words is "six hundred sixty-five thousand, four hundred fifty-seven".