55418161 has 4 divisors (see below), whose sum is σ = 55449712. Its totient is φ = 55386612.

The previous prime is 55418131. The next prime is 55418171. The reversal of 55418161 is 16181455.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16181455 = 5 ⋅3236291.

It is a cyclic number.

It is not a de Polignac number, because 55418161 - 2²⁵ = 21863729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55418131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12975 + ... + 16708.

It is an arithmetic number, because the mean of its divisors is an integer number (13862428).

Almost surely, 2^55418161 is an apocalyptic number.

It is an amenable number.

55418161 is a deficient number, since it is larger than the sum of its proper divisors (31551).

55418161 is a wasteful number, since it uses less digits than its factorization.

55418161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31550.

The product of its digits is 4800, while the sum is 31.

The square root of 55418161 is about 7444.3375124990. The cubic root of 55418161 is about 381.2565995095.

It can be divided in two parts, 55418 and 161, that multiplied together give a palindrome (8922298).

The spelling of 55418161 in words is "fifty-five million, four hundred eighteen thousand, one hundred sixty-one".