18979204807 has 2 divisors, whose sum is σ = 18979204808. Its totient is φ = 18979204806.

The previous prime is 18979204793. The next prime is 18979204891. The reversal of 18979204807 is 70840297981.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (70840297981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18979204807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18979204897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489602403 + 9489602404.

It is an arithmetic number, because the mean of its divisors is an integer number (9489602404).

Almost surely, 2^18979204807 is an apocalyptic number.

18979204807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18979204807 is an equidigital number, since it uses as much as digits as its factorization.

18979204807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 18979204807 in words is "eighteen billion, nine hundred seventy-nine million, two hundred four thousand, eight hundred seven".