661882256 has 20 divisors (see below), whose sum is σ = 1465596672. Its totient is φ = 283663776.

The previous prime is 661882253. The next prime is 661882259. The reversal of 661882256 is 652288166.

It is an interprime number because it is at equal distance from previous prime (661882253) and next prime (661882259).

It is not an unprimeable number, because it can be changed into a prime (661882253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2954720 + ... + 2954943.

Almost surely, 2^661882256 is an apocalyptic number.

It is an amenable number.

661882256 is an abundant number, since it is smaller than the sum of its proper divisors (803714416).

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

661882256 is a wasteful number, since it uses less digits than its factorization.

661882256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5909678 (or 5909672 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 661882256 is about 25727.0724335281. The cubic root of 661882256 is about 871.4856616697.

The spelling of 661882256 in words is "six hundred sixty-one million, eight hundred eighty-two thousand, two hundred fifty-six".