10001981992 has 8 divisors (see below), whose sum is σ = 18753716250. Its totient is φ = 5000990992.

The previous prime is 10001981987. The next prime is 10001982037. The reversal of 10001981992 is 29918910001.

It can be written as a sum of positive squares in only one way, i.e., 6944555556 + 3057426436 = 83334^2 + 55294^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625123867 + ... + 625123882.

Almost surely, 2^10001981992 is an apocalyptic number.

It is an amenable number.

10001981992 is a deficient number, since it is larger than the sum of its proper divisors (8751734258).

10001981992 is a wasteful number, since it uses less digits than its factorization.

10001981992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250247755 (or 1250247751 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 10001981992 in words is "ten billion, one million, nine hundred eighty-one thousand, nine hundred ninety-two".