202020199999 has 4 divisors (see below), whose sum is σ = 202178152960. Its totient is φ = 201862247040.

The previous prime is 202020199993. The next prime is 202020200003. The reversal of 202020199999 is 999991020202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999991020202 = 2 ⋅499995510101.

It is a cyclic number.

It is not a de Polignac number, because 202020199999 - 2⁵ = 202020199967 is a prime.

It is a super-2 number, since 2×202020199999² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020199993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78974562 + ... + 78977119.

It is an arithmetic number, because the mean of its divisors is an integer number (50544538240).

Almost surely, 2^202020199999 is an apocalyptic number.

202020199999 is a deficient number, since it is larger than the sum of its proper divisors (157952961).

202020199999 is a wasteful number, since it uses less digits than its factorization.

202020199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157952960.

The product of its (nonzero) digits is 472392, while the sum is 52.

The spelling of 202020199999 in words is "two hundred two billion, twenty million, one hundred ninety-nine thousand, nine hundred ninety-nine".