55208668637 has 2 divisors, whose sum is σ = 55208668638. Its totient is φ = 55208668636.

The previous prime is 55208668633. The next prime is 55208668639. The reversal of 55208668637 is 73686680255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40106470756 + 15102197881 = 200266^2 + 122891^2 .

It is a cyclic number.

It is not a de Polignac number, because 55208668637 - 2² = 55208668633 is a prime.

Together with 55208668639, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55208668633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27604334318 + 27604334319.

It is an arithmetic number, because the mean of its divisors is an integer number (27604334319).

Almost surely, 2^55208668637 is an apocalyptic number.

It is an amenable number.

55208668637 is a deficient number, since it is larger than the sum of its proper divisors (1).

55208668637 is an equidigital number, since it uses as much as digits as its factorization.

55208668637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14515200, while the sum is 56.

The spelling of 55208668637 in words is "fifty-five billion, two hundred eight million, six hundred sixty-eight thousand, six hundred thirty-seven".