55775817 has 24 divisors (see below), whose sum is σ = 83942880. Its totient is φ = 36602280.

The previous prime is 55775813. The next prime is 55775821. The reversal of 55775817 is 71857755.

It is an interprime number because it is at equal distance from previous prime (55775813) and next prime (55775821).

It is not a de Polignac number, because 55775817 - 2² = 55775813 is a prime.

It is a super-2 number, since 2×55775817² = 6221883524034978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55775813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168342 + ... + 168672.

It is an arithmetic number, because the mean of its divisors is an integer number (3497620).

Almost surely, 2^55775817 is an apocalyptic number.

It is an amenable number.

55775817 is a deficient number, since it is larger than the sum of its proper divisors (28167063).

55775817 is an equidigital number, since it uses as much as digits as its factorization.

55775817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 413 counting only the distinct ones).

The product of its digits is 343000, while the sum is 45.

The square root of 55775817 is about 7468.3208956231. The cubic root of 55775817 is about 382.0750220424.

The spelling of 55775817 in words is "fifty-five million, seven hundred seventy-five thousand, eight hundred seventeen".