82815866661 has 8 divisors (see below), whose sum is σ = 120459442464. Its totient is φ = 50191434320.

The previous prime is 82815866621. The next prime is 82815866669. The reversal of 82815866661 is 16666851828.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 82815866661 - 2⁷ = 82815866533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82815866669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1254785826 + ... + 1254785891.

It is an arithmetic number, because the mean of its divisors is an integer number (15057430308).

Almost surely, 2^82815866661 is an apocalyptic number.

It is an amenable number.

82815866661 is a deficient number, since it is larger than the sum of its proper divisors (37643575803).

82815866661 is a wasteful number, since it uses less digits than its factorization.

82815866661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509571731.

The product of its digits is 6635520, while the sum is 57.

The spelling of 82815866661 in words is "eighty-two billion, eight hundred fifteen million, eight hundred sixty-six thousand, six hundred sixty-one".