199989206502 has 32 divisors (see below), whose sum is σ = 408885481440. Its totient is φ = 65191192320.

The previous prime is 199989206491. The next prime is 199989206503. The reversal of 199989206502 is 205602989991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199989206503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1515927 + ... + 1642562.

It is an arithmetic number, because the mean of its divisors is an integer number (12777671295).

Almost surely, 2^199989206502 is an apocalyptic number.

199989206502 is an abundant number, since it is smaller than the sum of its proper divisors (208896274938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199989206502 is a wasteful number, since it uses less digits than its factorization.

199989206502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158728.

The product of its (nonzero) digits is 6298560, while the sum is 60.

The spelling of 199989206502 in words is "one hundred ninety-nine billion, nine hundred eighty-nine million, two hundred six thousand, five hundred two".