5181818623 has 2 divisors, whose sum is σ = 5181818624. Its totient is φ = 5181818622.

The previous prime is 5181818599. The next prime is 5181818683. The reversal of 5181818623 is 3268181815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5181818623 - 2⁵ = 5181818591 is a prime.

It is a super-2 number, since 2×5181818623² = 53702488483339232258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5181818623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5181818683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590909311 + 2590909312.

It is an arithmetic number, because the mean of its divisors is an integer number (2590909312).

Almost surely, 2^5181818623 is an apocalyptic number.

5181818623 is a deficient number, since it is larger than the sum of its proper divisors (1).

5181818623 is an equidigital number, since it uses as much as digits as its factorization.

5181818623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 43.

The square root of 5181818623 is about 71984.8499546953. The cubic root of 5181818623 is about 1730.4566964503.

The spelling of 5181818623 in words is "five billion, one hundred eighty-one million, eight hundred eighteen thousand, six hundred twenty-three".