818143640507 has 4 divisors (see below), whose sum is σ = 818202585720. Its totient is φ = 818084695296.

The previous prime is 818143640497. The next prime is 818143640527. The reversal of 818143640507 is 705046341818.

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 818143640507 - 2⁴ = 818143640491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818143640527) 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, 29451782 + ... + 29479547.

It is an arithmetic number, because the mean of its divisors is an integer number (204550646430).

Almost surely, 2^818143640507 is an apocalyptic number.

818143640507 is a deficient number, since it is larger than the sum of its proper divisors (58945213).

818143640507 is a wasteful number, since it uses less digits than its factorization.

818143640507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58945212.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 818143640507 in words is "eight hundred eighteen billion, one hundred forty-three million, six hundred forty thousand, five hundred seven".