55564664261 has 2 divisors, whose sum is σ = 55564664262. Its totient is φ = 55564664260.

The previous prime is 55564664219. The next prime is 55564664273. The reversal of 55564664261 is 16246646555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40038009025 + 15526655236 = 200095^2 + 124606^2 .

It is a cyclic number.

It is not a de Polignac number, because 55564664261 - 2¹⁰ = 55564663237 is a prime.

It is a super-2 number, since 2×55564664261² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55564664861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27782332130 + 27782332131.

It is an arithmetic number, because the mean of its divisors is an integer number (27782332131).

Almost surely, 2^55564664261 is an apocalyptic number.

It is an amenable number.

55564664261 is a deficient number, since it is larger than the sum of its proper divisors (1).

55564664261 is an equidigital number, since it uses as much as digits as its factorization.

55564664261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184000, while the sum is 50.

The spelling of 55564664261 in words is "fifty-five billion, five hundred sixty-four million, six hundred sixty-four thousand, two hundred sixty-one".