18390072079 has 2 divisors, whose sum is σ = 18390072080. Its totient is φ = 18390072078.

The previous prime is 18390072053. The next prime is 18390072109. The reversal of 18390072079 is 97027009381.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18390072079 - 2²³ = 18381683471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18390072979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9195036039 + 9195036040.

It is an arithmetic number, because the mean of its divisors is an integer number (9195036040).

Almost surely, 2^18390072079 is an apocalyptic number.

18390072079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18390072079 is an equidigital number, since it uses as much as digits as its factorization.

18390072079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 18390072079 in words is "eighteen billion, three hundred ninety million, seventy-two thousand, seventy-nine".