55491818 has 8 divisors (see below), whose sum is σ = 87618720. Its totient is φ = 26285580.

The previous prime is 55491817. The next prime is 55491827. The reversal of 55491818 is 81819455.

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

It is not an unprimeable number, because it can be changed into a prime (55491811) 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, 730118 + ... + 730193.

It is an arithmetic number, because the mean of its divisors is an integer number (10952340).

Almost surely, 2^55491818 is an apocalyptic number.

55491818 is a deficient number, since it is larger than the sum of its proper divisors (32126902).

55491818 is a wasteful number, since it uses less digits than its factorization.

55491818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460332.

The product of its digits is 57600, while the sum is 41.

The square root of 55491818 is about 7449.2830527508. The cubic root of 55491818 is about 381.4254357691.

The spelling of 55491818 in words is "fifty-five million, four hundred ninety-one thousand, eight hundred eighteen".