18720146923 has 2 divisors, whose sum is σ = 18720146924. Its totient is φ = 18720146922.

The previous prime is 18720146873. The next prime is 18720146941. The reversal of 18720146923 is 32964102781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18720146923 - 2²¹ = 18718049771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18720146923.

It is not a weakly prime, because it can be changed into another prime (18720146023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9360073461 + 9360073462.

It is an arithmetic number, because the mean of its divisors is an integer number (9360073462).

Almost surely, 2^18720146923 is an apocalyptic number.

18720146923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18720146923 is an equidigital number, since it uses as much as digits as its factorization.

18720146923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 18720146923 in words is "eighteen billion, seven hundred twenty million, one hundred forty-six thousand, nine hundred twenty-three".