55577999 has 4 divisors (see below), whose sum is σ = 55823064. Its totient is φ = 55332936.

The previous prime is 55577989. The next prime is 55578011. The reversal of 55577999 is 99977555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55577999 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55577909) 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, 122192 + ... + 122645.

It is an arithmetic number, because the mean of its divisors is an integer number (13955766).

Almost surely, 2^55577999 is an apocalyptic number.

55577999 is a deficient number, since it is larger than the sum of its proper divisors (245065).

55577999 is a wasteful number, since it uses less digits than its factorization.

55577999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245064.

The product of its digits is 4465125, while the sum is 56.

The square root of 55577999 is about 7455.0653249988. The cubic root of 55577999 is about 381.6227899278.

The spelling of 55577999 in words is "fifty-five million, five hundred seventy-seven thousand, nine hundred ninety-nine".