55400018 has 4 divisors (see below), whose sum is σ = 83100030. Its totient is φ = 27700008.

The previous prime is 55400011. The next prime is 55400027. The reversal of 55400018 is 81000455.

55400018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81000455 = 5 ⋅16200091.

It can be written as a sum of positive squares in only one way, i.e., 55011889 + 388129 = 7417^2 + 623^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55399966 and 55400002.

It is not an unprimeable number, because it can be changed into a prime (55400011) 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 as a sum of consecutive naturals, namely, 13850003 + ... + 13850006.

Almost surely, 2^55400018 is an apocalyptic number.

55400018 is a deficient number, since it is larger than the sum of its proper divisors (27700012).

55400018 is a wasteful number, since it uses less digits than its factorization.

55400018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27700011.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 55400018 is about 7443.1188355420. The cubic root of 55400018 is about 381.2149892422.

The spelling of 55400018 in words is "fifty-five million, four hundred thousand, eighteen".