1056656661 has 4 divisors (see below), whose sum is σ = 1408875552. Its totient is φ = 704437772.

The previous prime is 1056656659. The next prime is 1056656737. The reversal of 1056656661 is 1666566501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1056656661 - 2¹ = 1056656659 is a prime.

It is a super-2 number, since 2×1056656661² = 2233046598471337842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056652661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176109441 + ... + 176109446.

It is an arithmetic number, because the mean of its divisors is an integer number (352218888).

Almost surely, 2^1056656661 is an apocalyptic number.

It is an amenable number.

1056656661 is a deficient number, since it is larger than the sum of its proper divisors (352218891).

1056656661 is an equidigital number, since it uses as much as digits as its factorization.

1056656661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352218890.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1056656661 is about 32506.2557210147. The cubic root of 1056656661 is about 1018.5397087066.

The spelling of 1056656661 in words is "one billion, fifty-six million, six hundred fifty-six thousand, six hundred sixty-one".