55605999 has 4 divisors (see below), whose sum is σ = 74141336. Its totient is φ = 37070664.

The previous prime is 55605941. The next prime is 55606003. The reversal of 55605999 is 99950655.

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

It is not a de Polignac number, because 55605999 - 2⁷ = 55605871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55605919) 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, 9267664 + ... + 9267669.

It is an arithmetic number, because the mean of its divisors is an integer number (18535334).

Almost surely, 2^55605999 is an apocalyptic number.

55605999 is a deficient number, since it is larger than the sum of its proper divisors (18535337).

55605999 is a wasteful number, since it uses less digits than its factorization.

55605999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18535336.

The product of its (nonzero) digits is 546750, while the sum is 48.

The square root of 55605999 is about 7456.9430063532. The cubic root of 55605999 is about 381.6868659074.

The spelling of 55605999 in words is "fifty-five million, six hundred five thousand, nine hundred ninety-nine".