55181718 has 12 divisors (see below), whose sum is σ = 119560428. Its totient is φ = 18393900.

The previous prime is 55181701. The next prime is 55181723. The reversal of 55181718 is 81718155.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1532808 + ... + 1532843.

It is an arithmetic number, because the mean of its divisors is an integer number (9963369).

Almost surely, 2^55181718 is an apocalyptic number.

55181718 is an abundant number, since it is smaller than the sum of its proper divisors (64378710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55181718 is a wasteful number, since it uses less digits than its factorization.

55181718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065659 (or 3065656 counting only the distinct ones).

The product of its digits is 11200, while the sum is 36.

The square root of 55181718 is about 7428.4398092735. The cubic root of 55181718 is about 380.7136128790.

The spelling of 55181718 in words is "fifty-five million, one hundred eighty-one thousand, seven hundred eighteen".