55621633187 has 2 divisors, whose sum is σ = 55621633188. Its totient is φ = 55621633186.

The previous prime is 55621633169. The next prime is 55621633229. The reversal of 55621633187 is 78133612655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55621633187 - 2⁸ = 55621632931 is a prime.

It is not a weakly prime, because it can be changed into another prime (55621633157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27810816593 + 27810816594.

It is an arithmetic number, because the mean of its divisors is an integer number (27810816594).

Almost surely, 2^55621633187 is an apocalyptic number.

55621633187 is a deficient number, since it is larger than the sum of its proper divisors (1).

55621633187 is an equidigital number, since it uses as much as digits as its factorization.

55621633187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 47.

The spelling of 55621633187 in words is "fifty-five billion, six hundred twenty-one million, six hundred thirty-three thousand, one hundred eighty-seven".