82581215278 has 4 divisors (see below), whose sum is σ = 123871822920. Its totient is φ = 41290607638.

The previous prime is 82581215263. The next prime is 82581215293. The reversal of 82581215278 is 87251218528.

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

It is an interprime number because it is at equal distance from previous prime (82581215263) and next prime (82581215293).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 20645303818 + ... + 20645303821.

It is an arithmetic number, because the mean of its divisors is an integer number (30967955730).

Almost surely, 2^82581215278 is an apocalyptic number.

82581215278 is a deficient number, since it is larger than the sum of its proper divisors (41290607642).

82581215278 is a wasteful number, since it uses less digits than its factorization.

82581215278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41290607641.

The product of its digits is 716800, while the sum is 49.

The spelling of 82581215278 in words is "eighty-two billion, five hundred eighty-one million, two hundred fifteen thousand, two hundred seventy-eight".