55374464221 has 2 divisors, whose sum is σ = 55374464222. Its totient is φ = 55374464220.

The previous prime is 55374464179. The next prime is 55374464261. The reversal of 55374464221 is 12246447355.

55374464221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31395941721 + 23978522500 = 177189^2 + 154850^2 .

It is a cyclic number.

It is not a de Polignac number, because 55374464221 - 2⁹ = 55374463709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55374464261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27687232110 + 27687232111.

It is an arithmetic number, because the mean of its divisors is an integer number (27687232111).

Almost surely, 2^55374464221 is an apocalyptic number.

It is an amenable number.

55374464221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55374464221 is an equidigital number, since it uses as much as digits as its factorization.

55374464221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 43.

The spelling of 55374464221 in words is "fifty-five billion, three hundred seventy-four million, four hundred sixty-four thousand, two hundred twenty-one".