665233566 has 16 divisors (see below), whose sum is σ = 1344184464. Its totient is φ = 219458304.

The previous prime is 665233559. The next prime is 665233573. The reversal of 665233566 is 665332566.

It is an interprime number because it is at equal distance from previous prime (665233559) and next prime (665233573).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570925 + ... + 572088.

It is an arithmetic number, because the mean of its divisors is an integer number (84011529).

Almost surely, 2^665233566 is an apocalyptic number.

665233566 is an abundant number, since it is smaller than the sum of its proper divisors (678950898).

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

665233566 is a wasteful number, since it uses less digits than its factorization.

665233566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143115.

The product of its digits is 583200, while the sum is 42.

The square root of 665233566 is about 25792.1221693757. The cubic root of 665233566 is about 872.9540512917.

The spelling of 665233566 in words is "six hundred sixty-five million, two hundred thirty-three thousand, five hundred sixty-six".