82143971999 has 4 divisors (see below), whose sum is σ = 82145581440. Its totient is φ = 82142362560.

The previous prime is 82143971911. The next prime is 82143972007. The reversal of 82143971999 is 99917934128.

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

It is a cyclic number.

It is not a de Polignac number, because 82143971999 - 2¹⁶ = 82143906463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82143971599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725567 + ... + 831104.

It is an arithmetic number, because the mean of its divisors is an integer number (20536395360).

Almost surely, 2^82143971999 is an apocalyptic number.

82143971999 is a deficient number, since it is larger than the sum of its proper divisors (1609441).

82143971999 is a wasteful number, since it uses less digits than its factorization.

82143971999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609440.

The product of its digits is 8817984, while the sum is 62.

The spelling of 82143971999 in words is "eighty-two billion, one hundred forty-three million, nine hundred seventy-one thousand, nine hundred ninety-nine".