55818997 has 8 divisors (see below), whose sum is σ = 62186040. Its totient is φ = 49748160.

The previous prime is 55818991. The next prime is 55819037. The reversal of 55818997 is 79981855.

It can be written as a sum of positive squares in 4 ways, for example, as 77841 + 55741156 = 279^2 + 7466^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55818997 - 2¹⁵ = 55786229 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 (55818991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73654 + ... + 74407.

It is an arithmetic number, because the mean of its divisors is an integer number (7773255).

Almost surely, 2^55818997 is an apocalyptic number.

It is an amenable number.

55818997 is a deficient number, since it is larger than the sum of its proper divisors (6367043).

55818997 is a wasteful number, since it uses less digits than its factorization.

55818997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148103.

The product of its digits is 907200, while the sum is 52.

The square root of 55818997 is about 7471.2112137190. The cubic root of 55818997 is about 382.1735936979.

The spelling of 55818997 in words is "fifty-five million, eight hundred eighteen thousand, nine hundred ninety-seven".