18432172079 has 2 divisors, whose sum is σ = 18432172080. Its totient is φ = 18432172078.

The previous prime is 18432172039. The next prime is 18432172133. The reversal of 18432172079 is 97027123481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18432172079 - 2¹² = 18432167983 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18432172039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9216086039 + 9216086040.

It is an arithmetic number, because the mean of its divisors is an integer number (9216086040).

Almost surely, 2^18432172079 is an apocalyptic number.

18432172079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18432172079 is an equidigital number, since it uses as much as digits as its factorization.

18432172079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 18432172079 in words is "eighteen billion, four hundred thirty-two million, one hundred seventy-two thousand, seventy-nine".