82501608491 has 4 divisors (see below), whose sum is σ = 82638882984. Its totient is φ = 82364334000.

The previous prime is 82501608487. The next prime is 82501608517. The reversal of 82501608491 is 19480610528.

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 82501608491 - 2² = 82501608487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82501608691) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 68636345 + ... + 68637546.

It is an arithmetic number, because the mean of its divisors is an integer number (20659720746).

Almost surely, 2^82501608491 is an apocalyptic number.

82501608491 is a deficient number, since it is larger than the sum of its proper divisors (137274493).

82501608491 is a wasteful number, since it uses less digits than its factorization.

82501608491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137274492.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 82501608491 in words is "eighty-two billion, five hundred one million, six hundred eight thousand, four hundred ninety-one".