55136255221 has 2 divisors, whose sum is σ = 55136255222. Its totient is φ = 55136255220.

The previous prime is 55136255189. The next prime is 55136255243. The reversal of 55136255221 is 12255263155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33962804100 + 21173451121 = 184290^2 + 145511^2 .

It is a cyclic number.

It is not a de Polignac number, because 55136255221 - 2⁵ = 55136255189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55136252221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27568127610 + 27568127611.

It is an arithmetic number, because the mean of its divisors is an integer number (27568127611).

Almost surely, 2^55136255221 is an apocalyptic number.

It is an amenable number.

55136255221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55136255221 is an equidigital number, since it uses as much as digits as its factorization.

55136255221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90000, while the sum is 37.

The spelling of 55136255221 in words is "fifty-five billion, one hundred thirty-six million, two hundred fifty-five thousand, two hundred twenty-one".