19981871002 has 8 divisors (see below), whose sum is σ = 30538331316. Its totient is φ = 9802427232.

The previous prime is 19981870991. The next prime is 19981871011. The reversal of 19981871002 is 20017818991.

It can be written as a sum of positive squares in 2 ways, for example, as 16169919921 + 3811951081 = 127161^2 + 61741^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94254003 + ... + 94254214.

Almost surely, 2^19981871002 is an apocalyptic number.

19981871002 is a deficient number, since it is larger than the sum of its proper divisors (10556460314).

19981871002 is a wasteful number, since it uses less digits than its factorization.

19981871002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188508272.

The product of its (nonzero) digits is 72576, while the sum is 46.

The spelling of 19981871002 in words is "nineteen billion, nine hundred eighty-one million, eight hundred seventy-one thousand, two".