19819999982 has 4 divisors (see below), whose sum is σ = 29729999976. Its totient is φ = 9909999990.

The previous prime is 19819999963. The next prime is 19819999987. The reversal of 19819999982 is 28999991891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19819999987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4954999994 + ... + 4954999997.

It is an arithmetic number, because the mean of its divisors is an integer number (7432499994).

Almost surely, 2^19819999982 is an apocalyptic number.

19819999982 is a deficient number, since it is larger than the sum of its proper divisors (9909999994).

19819999982 is an equidigital number, since it uses as much as digits as its factorization.

19819999982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9909999993.

The product of its digits is 68024448, while the sum is 74.

The spelling of 19819999982 in words is "nineteen billion, eight hundred nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-two".