55131583657 has 2 divisors, whose sum is σ = 55131583658. Its totient is φ = 55131583656.

The previous prime is 55131583651. The next prime is 55131583691. The reversal of 55131583657 is 75638513155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42500296336 + 12631287321 = 206156^2 + 112389^2 .

It is a cyclic number.

It is not a de Polignac number, because 55131583657 - 2³ = 55131583649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55131583657.

It is not a weakly prime, because it can be changed into another prime (55131583651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27565791828 + 27565791829.

It is an arithmetic number, because the mean of its divisors is an integer number (27565791829).

Almost surely, 2^55131583657 is an apocalyptic number.

It is an amenable number.

55131583657 is a deficient number, since it is larger than the sum of its proper divisors (1).

55131583657 is an equidigital number, since it uses as much as digits as its factorization.

55131583657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890000, while the sum is 49.

The spelling of 55131583657 in words is "fifty-five billion, one hundred thirty-one million, five hundred eighty-three thousand, six hundred fifty-seven".