55815681679 has 2 divisors, whose sum is σ = 55815681680. Its totient is φ = 55815681678.

The previous prime is 55815681671. The next prime is 55815681697. The reversal of 55815681679 is 97618651855.

Together with next prime (55815681697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55815681679 - 2³ = 55815681671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55815681671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27907840839 + 27907840840.

It is an arithmetic number, because the mean of its divisors is an integer number (27907840840).

Almost surely, 2^55815681679 is an apocalyptic number.

55815681679 is a deficient number, since it is larger than the sum of its proper divisors (1).

55815681679 is an equidigital number, since it uses as much as digits as its factorization.

55815681679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144000, while the sum is 61.

The spelling of 55815681679 in words is "fifty-five billion, eight hundred fifteen million, six hundred eighty-one thousand, six hundred seventy-nine".