55564187881 has 2 divisors, whose sum is σ = 55564187882. Its totient is φ = 55564187880.

The previous prime is 55564187869. The next prime is 55564187893. The reversal of 55564187881 is 18878146555.

It is a balanced prime because it is at equal distance from previous prime (55564187869) and next prime (55564187893).

It can be written as a sum of positive squares in only one way, i.e., 27847265625 + 27716922256 = 166875^2 + 166484^2 .

It is a cyclic number.

It is not a de Polignac number, because 55564187881 - 2⁵ = 55564187849 is a prime.

It is a super-2 number, since 2×55564187881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55564187821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27782093940 + 27782093941.

It is an arithmetic number, because the mean of its divisors is an integer number (27782093941).

Almost surely, 2^55564187881 is an apocalyptic number.

It is an amenable number.

55564187881 is a deficient number, since it is larger than the sum of its proper divisors (1).

55564187881 is an equidigital number, since it uses as much as digits as its factorization.

55564187881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752000, while the sum is 58.

The spelling of 55564187881 in words is "fifty-five billion, five hundred sixty-four million, one hundred eighty-seven thousand, eight hundred eighty-one".