55556899 has 4 divisors (see below), whose sum is σ = 55612440. Its totient is φ = 55501360.

The previous prime is 55556887. The next prime is 55556923. The reversal of 55556899 is 99865555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99865555 = 5 ⋅19973111.

It is a cyclic number.

It is not a de Polignac number, because 55556899 - 2¹⁷ = 55425827 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55556099) 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, 26242 + ... + 28279.

It is an arithmetic number, because the mean of its divisors is an integer number (13903110).

Almost surely, 2^55556899 is an apocalyptic number.

55556899 is a deficient number, since it is larger than the sum of its proper divisors (55541).

55556899 is a wasteful number, since it uses less digits than its factorization.

55556899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55540.

The product of its digits is 2430000, while the sum is 52.

The square root of 55556899 is about 7453.6500454475. The cubic root of 55556899 is about 381.5744898796.

The spelling of 55556899 in words is "fifty-five million, five hundred fifty-six thousand, eight hundred ninety-nine".