19902202878 has 16 divisors (see below), whose sum is σ = 41899374720. Its totient is φ = 6284906136.

The previous prime is 19902202871. The next prime is 19902202919. The reversal of 19902202878 is 87820220991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19902202871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87290250 + ... + 87290477.

It is an arithmetic number, because the mean of its divisors is an integer number (2618710920).

Almost surely, 2^19902202878 is an apocalyptic number.

19902202878 is an abundant number, since it is smaller than the sum of its proper divisors (21997171842).

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

19902202878 is a wasteful number, since it uses less digits than its factorization.

19902202878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174580751.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 19902202878 in words is "nineteen billion, nine hundred two million, two hundred two thousand, eight hundred seventy-eight".