185923454989 has 2 divisors, whose sum is σ = 185923454990. Its totient is φ = 185923454988.

The previous prime is 185923454921. The next prime is 185923454993. The reversal of 185923454989 is 989454329581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125054176900 + 60869278089 = 353630^2 + 246717^2 .

It is a cyclic number.

It is not a de Polignac number, because 185923454989 - 2⁷ = 185923454861 is a prime.

It is a super-2 number, since 2×185923454989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185923454909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92961727494 + 92961727495.

It is an arithmetic number, because the mean of its divisors is an integer number (92961727495).

Almost surely, 2^185923454989 is an apocalyptic number.

It is an amenable number.

185923454989 is a deficient number, since it is larger than the sum of its proper divisors (1).

185923454989 is an equidigital number, since it uses as much as digits as its factorization.

185923454989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111974400, while the sum is 67.

The spelling of 185923454989 in words is "one hundred eighty-five billion, nine hundred twenty-three million, four hundred fifty-four thousand, nine hundred eighty-nine".