55186270421 has 2 divisors, whose sum is σ = 55186270422. Its totient is φ = 55186270420.

The previous prime is 55186270367. The next prime is 55186270441. The reversal of 55186270421 is 12407268155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54508240900 + 678029521 = 233470^2 + 26039^2 .

It is a cyclic number.

It is not a de Polignac number, because 55186270421 - 2³⁰ = 54112528597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55186270441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27593135210 + 27593135211.

It is an arithmetic number, because the mean of its divisors is an integer number (27593135211).

Almost surely, 2^55186270421 is an apocalyptic number.

It is an amenable number.

55186270421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55186270421 is an equidigital number, since it uses as much as digits as its factorization.

55186270421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 55186270421 in words is "fifty-five billion, one hundred eighty-six million, two hundred seventy thousand, four hundred twenty-one".