55398566161 has 3 divisors (see below), whose sum is σ = 55398801531. Its totient is φ = 55398330792.

The previous prime is 55398566149. The next prime is 55398566177. The reversal of 55398566161 is 16166589355.

The square root of 55398566161 is 235369.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 55263076561 + 135489600 = 235081^2 + 11640^2 .

It is not a de Polignac number, because 55398566161 - 2¹³ = 55398557969 is a prime.

It is a super-2 number, since 2×55398566161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55398566261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 117685 + ... + 353053.

It is an arithmetic number, because the mean of its divisors is an integer number (18466267177).

Almost surely, 2^55398566161 is an apocalyptic number.

55398566161 is the 235369-th square number.

55398566161 is the 117685-th centered octagonal number.

It is an amenable number.

55398566161 is a deficient number, since it is larger than the sum of its proper divisors (235370).

55398566161 is an frugal number, since it uses more digits than its factorization.

55398566161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470738 (or 235369 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 55.

The spelling of 55398566161 in words is "fifty-five billion, three hundred ninety-eight million, five hundred sixty-six thousand, one hundred sixty-one".