665650256 has 20 divisors (see below), whose sum is σ = 1357576800. Its totient is φ = 315307872.

The previous prime is 665650241. The next prime is 665650273. The reversal of 665650256 is 652056566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094516 + ... + 1095123.

It is an arithmetic number, because the mean of its divisors is an integer number (67878840).

Almost surely, 2^665650256 is an apocalyptic number.

It is an amenable number.

665650256 is an abundant number, since it is smaller than the sum of its proper divisors (691926544).

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

665650256 is a wasteful number, since it uses less digits than its factorization.

665650256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189666 (or 2189660 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 665650256 is about 25800.1987589243. The cubic root of 665650256 is about 873.1362806718.

The spelling of 665650256 in words is "six hundred sixty-five million, six hundred fifty thousand, two hundred fifty-six".