1318820640259 has 4 divisors (see below), whose sum is σ = 1318873064040. Its totient is φ = 1318768216480.

The previous prime is 1318820640227. The next prime is 1318820640283. The reversal of 1318820640259 is 9520460288131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1318820640259 - 2⁵ = 1318820640227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318820640859) 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, 26174137 + ... + 26224474.

It is an arithmetic number, because the mean of its divisors is an integer number (329718266010).

Almost surely, 2^{1318820640259} is an apocalyptic number.

1318820640259 is a deficient number, since it is larger than the sum of its proper divisors (52423781).

1318820640259 is an equidigital number, since it uses as much as digits as its factorization.

1318820640259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52423780.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 1318820640259 in words is "one trillion, three hundred eighteen billion, eight hundred twenty million, six hundred forty thousand, two hundred fifty-nine".