56417617561 has 2 divisors, whose sum is σ = 56417617562. Its totient is φ = 56417617560.

The previous prime is 56417617549. The next prime is 56417617673. The reversal of 56417617561 is 16571671465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39428059225 + 16989558336 = 198565^2 + 130344^2 .

It is a cyclic number.

It is not a de Polignac number, because 56417617561 - 2¹⁹ = 56417093273 is a prime.

It is not a weakly prime, because it can be changed into another prime (56417617541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28208808780 + 28208808781.

It is an arithmetic number, because the mean of its divisors is an integer number (28208808781).

Almost surely, 2^56417617561 is an apocalyptic number.

It is an amenable number.

56417617561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56417617561 is an equidigital number, since it uses as much as digits as its factorization.

56417617561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 49.

The spelling of 56417617561 in words is "fifty-six billion, four hundred seventeen million, six hundred seventeen thousand, five hundred sixty-one".