82102215838 has 4 divisors (see below), whose sum is σ = 123153323760. Its totient is φ = 41051107918.

The previous prime is 82102215799. The next prime is 82102215841. The reversal of 82102215838 is 83851220128.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 82102215838.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20525553958 + ... + 20525553961.

It is an arithmetic number, because the mean of its divisors is an integer number (30788330940).

Almost surely, 2^82102215838 is an apocalyptic number.

82102215838 is a deficient number, since it is larger than the sum of its proper divisors (41051107922).

82102215838 is a wasteful number, since it uses less digits than its factorization.

82102215838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41051107921.

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 82102215838 in words is "eighty-two billion, one hundred two million, two hundred fifteen thousand, eight hundred thirty-eight".