18421565479 has 2 divisors, whose sum is σ = 18421565480. Its totient is φ = 18421565478.

The previous prime is 18421565453. The next prime is 18421565521. The reversal of 18421565479 is 97456512481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18421565479 - 2¹⁵ = 18421532711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18421565429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9210782739 + 9210782740.

It is an arithmetic number, because the mean of its divisors is an integer number (9210782740).

Almost surely, 2^18421565479 is an apocalyptic number.

18421565479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18421565479 is an equidigital number, since it uses as much as digits as its factorization.

18421565479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 52.

The spelling of 18421565479 in words is "eighteen billion, four hundred twenty-one million, five hundred sixty-five thousand, four hundred seventy-nine".