18028723897 has 2 divisors, whose sum is σ = 18028723898. Its totient is φ = 18028723896.

The previous prime is 18028723883. The next prime is 18028723943. The reversal of 18028723897 is 79832782081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9996800256 + 8031923641 = 99984^2 + 89621^2 .

It is a cyclic number.

It is not a de Polignac number, because 18028723897 - 2¹¹ = 18028721849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18028723807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9014361948 + 9014361949.

It is an arithmetic number, because the mean of its divisors is an integer number (9014361949).

Almost surely, 2^18028723897 is an apocalyptic number.

It is an amenable number.

18028723897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18028723897 is an equidigital number, since it uses as much as digits as its factorization.

18028723897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 18028723897 in words is "eighteen billion, twenty-eight million, seven hundred twenty-three thousand, eight hundred ninety-seven".