661022056 has 16 divisors (see below), whose sum is σ = 1282155300. Its totient is φ = 319113984.

The previous prime is 661022051. The next prime is 661022059. The reversal of 661022056 is 650220166.

661022056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 661004100 + 17956 = 25710^2 + 134^2 .

It is not an unprimeable number, because it can be changed into a prime (661022051) 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, 1424385 + ... + 1424848.

Almost surely, 2^661022056 is an apocalyptic number.

It is an amenable number.

661022056 is a deficient number, since it is larger than the sum of its proper divisors (621133244).

661022056 is a wasteful number, since it uses less digits than its factorization.

661022056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849268 (or 2849264 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 661022056 is about 25710.3492002734. The cubic root of 661022056 is about 871.1079625900.

The spelling of 661022056 in words is "six hundred sixty-one million, twenty-two thousand, fifty-six".