56261154661 has 2 divisors, whose sum is σ = 56261154662. Its totient is φ = 56261154660.

The previous prime is 56261154641. The next prime is 56261154701. The reversal of 56261154661 is 16645116265.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47482589025 + 8778565636 = 217905^2 + 93694^2 .

It is a cyclic number.

It is not a de Polignac number, because 56261154661 - 2⁷ = 56261154533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56261154601) 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 as a sum of consecutive naturals, namely, 28130577330 + 28130577331.

It is an arithmetic number, because the mean of its divisors is an integer number (28130577331).

Almost surely, 2^56261154661 is an apocalyptic number.

It is an amenable number.

56261154661 is a deficient number, since it is larger than the sum of its proper divisors (1).

56261154661 is an equidigital number, since it uses as much as digits as its factorization.

56261154661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 43.

The spelling of 56261154661 in words is "fifty-six billion, two hundred sixty-one million, one hundred fifty-four thousand, six hundred sixty-one".