55207221605 has 4 divisors (see below), whose sum is σ = 66248665932. Its totient is φ = 44165777280.

The previous prime is 55207221551. The next prime is 55207221611. The reversal of 55207221605 is 50612270255.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29072296036 + 26134925569 = 170506^2 + 161663^2 .

It is not a de Polignac number, because 55207221605 - 2¹⁸ = 55206959461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5520722156 + ... + 5520722165.

It is an arithmetic number, because the mean of its divisors is an integer number (16562166483).

Almost surely, 2^55207221605 is an apocalyptic number.

It is an amenable number.

55207221605 is a deficient number, since it is larger than the sum of its proper divisors (11041444327).

55207221605 is a wasteful number, since it uses less digits than its factorization.

55207221605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11041444326.

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 55207221605 in words is "fifty-five billion, two hundred seven million, two hundred twenty-one thousand, six hundred five".