82507591666 has 8 divisors (see below), whose sum is σ = 123858155520. Its totient is φ = 41221539828.

The previous prime is 82507591591. The next prime is 82507591667. The reversal of 82507591666 is 66619570528.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (82507591667) 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, 16124806 + ... + 16129921.

It is an arithmetic number, because the mean of its divisors is an integer number (15482269440).

Almost surely, 2^82507591666 is an apocalyptic number.

82507591666 is a deficient number, since it is larger than the sum of its proper divisors (41350563854).

82507591666 is a wasteful number, since it uses less digits than its factorization.

82507591666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32256008.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 82507591666 in words is "eighty-two billion, five hundred seven million, five hundred ninety-one thousand, six hundred sixty-six".