2518418621 has 2 divisors, whose sum is σ = 2518418622. Its totient is φ = 2518418620.

The previous prime is 2518418549. The next prime is 2518418627. The reversal of 2518418621 is 1268148152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1711063225 + 807355396 = 41365^2 + 28414^2 .

It is a cyclic number.

It is not a de Polignac number, because 2518418621 - 2¹⁰ = 2518417597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2518418627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1259209310 + 1259209311.

It is an arithmetic number, because the mean of its divisors is an integer number (1259209311).

Almost surely, 2^2518418621 is an apocalyptic number.

It is an amenable number.

2518418621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2518418621 is an equidigital number, since it uses as much as digits as its factorization.

2518418621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 38.

The square root of 2518418621 is about 50183.8482083628. The cubic root of 2518418621 is about 1360.5337115535.

The spelling of 2518418621 in words is "two billion, five hundred eighteen million, four hundred eighteen thousand, six hundred twenty-one".