199257402689 has 4 divisors (see below), whose sum is σ = 199332398724. Its totient is φ = 199182406656.

The previous prime is 199257402677. The next prime is 199257402697. The reversal of 199257402689 is 986204752991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122564408464 + 76692994225 = 350092^2 + 276935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199257402689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199257402629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37494032 + ... + 37499345.

It is an arithmetic number, because the mean of its divisors is an integer number (49833099681).

Almost surely, 2^199257402689 is an apocalyptic number.

It is an amenable number.

199257402689 is a deficient number, since it is larger than the sum of its proper divisors (74996035).

199257402689 is an equidigital number, since it uses as much as digits as its factorization.

199257402689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74996034.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 199257402689 in words is "one hundred ninety-nine billion, two hundred fifty-seven million, four hundred two thousand, six hundred eighty-nine".