55400555 has 32 divisors (see below), whose sum is σ = 78617088. Its totient is φ = 36691200.

The previous prime is 55400549. The next prime is 55400557. The reversal of 55400555 is 55500455.

It is not a de Polignac number, because 55400555 - 2⁴ = 55400539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55400557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197015 + ... + 197295.

It is an arithmetic number, because the mean of its divisors is an integer number (2456784).

Almost surely, 2^55400555 is an apocalyptic number.

55400555 is a deficient number, since it is larger than the sum of its proper divisors (23216533).

55400555 is a wasteful number, since it uses less digits than its factorization.

55400555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 12500, while the sum is 29.

The square root of 55400555 is about 7443.1549090423. The cubic root of 55400555 is about 381.2162209614.

It can be divided in two parts, 55400 and 555, that added together give a palindrome (55955).

The spelling of 55400555 in words is "fifty-five million, four hundred thousand, five hundred fifty-five".