82811974646 has 4 divisors (see below), whose sum is σ = 124217961972. Its totient is φ = 41405987322.

The previous prime is 82811974631. The next prime is 82811974667. The reversal of 82811974646 is 64647911828.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 82811974591 and 82811974600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20702993660 + ... + 20702993663.

It is an arithmetic number, because the mean of its divisors is an integer number (31054490493).

Almost surely, 2^82811974646 is an apocalyptic number.

82811974646 is a deficient number, since it is larger than the sum of its proper divisors (41405987326).

82811974646 is a wasteful number, since it uses less digits than its factorization.

82811974646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41405987325.

The product of its digits is 4644864, while the sum is 56.

The spelling of 82811974646 in words is "eighty-two billion, eight hundred eleven million, nine hundred seventy-four thousand, six hundred forty-six".