18719143807 has 24 divisors (see below), whose sum is σ = 23504860176. Its totient is φ = 14776328448.

The previous prime is 18719143801. The next prime is 18719143811. The reversal of 18719143807 is 70834191781.

It is not a de Polignac number, because 18719143807 - 2²³ = 18710755199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18719143801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241888 + ... + 309754.

It is an arithmetic number, because the mean of its divisors is an integer number (979369174).

Almost surely, 2^18719143807 is an apocalyptic number.

18719143807 is a deficient number, since it is larger than the sum of its proper divisors (4785716369).

18719143807 is a wasteful number, since it uses less digits than its factorization.

18719143807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68327 (or 68320 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 18719143807 in words is "eighteen billion, seven hundred nineteen million, one hundred forty-three thousand, eight hundred seven".