18649722079 has 2 divisors, whose sum is σ = 18649722080. Its totient is φ = 18649722078.

The previous prime is 18649722067. The next prime is 18649722083. The reversal of 18649722079 is 97022794681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18649722079 - 2²³ = 18641333471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18649722019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9324861039 + 9324861040.

It is an arithmetic number, because the mean of its divisors is an integer number (9324861040).

Almost surely, 2^18649722079 is an apocalyptic number.

18649722079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18649722079 is an equidigital number, since it uses as much as digits as its factorization.

18649722079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 18649722079 in words is "eighteen billion, six hundred forty-nine million, seven hundred twenty-two thousand, seventy-nine".