665651056 has 20 divisors (see below), whose sum is σ = 1473941872. Its totient is φ = 285278976.

The previous prime is 665651047. The next prime is 665651071. The reversal of 665651056 is 650156566.

665651056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 2971545 + ... + 2971768.

Almost surely, 2^665651056 is an apocalyptic number.

It is an amenable number.

665651056 is an abundant number, since it is smaller than the sum of its proper divisors (808290816).

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

665651056 is a wasteful number, since it uses less digits than its factorization.

665651056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943328 (or 5943322 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 665651056 is about 25800.2142626762. The cubic root of 665651056 is about 873.1366304594.

It can be divided in two parts, 6656510 and 56, that added together give a palindrome (6656566).

The spelling of 665651056 in words is "six hundred sixty-five million, six hundred fifty-one thousand, fifty-six".