189999368873 has 2 divisors, whose sum is σ = 189999368874. Its totient is φ = 189999368872.

The previous prime is 189999368813. The next prime is 189999368887. The reversal of 189999368873 is 378863999981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189570547609 + 428821264 = 435397^2 + 20708^2 .

It is a cyclic number.

It is not a de Polignac number, because 189999368873 - 2²⁰ = 189998320297 is a prime.

It is not a weakly prime, because it can be changed into another prime (189999368813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94999684436 + 94999684437.

It is an arithmetic number, because the mean of its divisors is an integer number (94999684437).

Almost surely, 2^189999368873 is an apocalyptic number.

It is an amenable number.

189999368873 is a deficient number, since it is larger than the sum of its proper divisors (1).

189999368873 is an equidigital number, since it uses as much as digits as its factorization.

189999368873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1269789696, while the sum is 80.

The spelling of 189999368873 in words is "one hundred eighty-nine billion, nine hundred ninety-nine million, three hundred sixty-eight thousand, eight hundred seventy-three".