55817643 has 16 divisors (see below), whose sum is σ = 85729280. Its totient is φ = 31643136.

The previous prime is 55817627. The next prime is 55817651. The reversal of 55817643 is 34671855.

It is not a de Polignac number, because 55817643 - 2⁴ = 55817627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55817653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7798 + ... + 13131.

It is an arithmetic number, because the mean of its divisors is an integer number (5358080).

Almost surely, 2^55817643 is an apocalyptic number.

55817643 is a deficient number, since it is larger than the sum of its proper divisors (29911637).

55817643 is a wasteful number, since it uses less digits than its factorization.

55817643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21066.

The product of its digits is 100800, while the sum is 39.

The square root of 55817643 is about 7471.1205986786. The cubic root of 55817643 is about 382.1705035479.

The spelling of 55817643 in words is "fifty-five million, eight hundred seventeen thousand, six hundred forty-three".