665623224 has 64 divisors (see below), whose sum is σ = 2113094400. Its totient is φ = 190177632.

The previous prime is 665623207. The next prime is 665623241. The reversal of 665623224 is 422326566.

665623224 is a `hidden beast` number, since 6 + 6 + 5 + 623 + 2 + 24 = 666.

It is an interprime number because it is at equal distance from previous prime (665623207) and next prime (665623241).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218602 + ... + 221625.

It is an arithmetic number, because the mean of its divisors is an integer number (33017100).

Almost surely, 2^665623224 is an apocalyptic number.

It is an amenable number.

665623224 is an abundant number, since it is smaller than the sum of its proper divisors (1447471176).

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

665623224 is a wasteful number, since it uses less digits than its factorization.

665623224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440249 (or 440239 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 665623224 is about 25799.6748816724. The cubic root of 665623224 is about 873.1244611819.

The spelling of 665623224 in words is "six hundred sixty-five million, six hundred twenty-three thousand, two hundred twenty-four".