82986697991 has 4 divisors (see below), whose sum is σ = 83792394192. Its totient is φ = 82181001792.

The previous prime is 82986697979. The next prime is 82986698023. The reversal of 82986697991 is 19979668928.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82986697991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82986697951) 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, 402847946 + ... + 402848151.

It is an arithmetic number, because the mean of its divisors is an integer number (20948098548).

Almost surely, 2^82986697991 is an apocalyptic number.

82986697991 is a deficient number, since it is larger than the sum of its proper divisors (805696201).

82986697991 is a wasteful number, since it uses less digits than its factorization.

82986697991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805696200.

The product of its digits is 211631616, while the sum is 74.

The spelling of 82986697991 in words is "eighty-two billion, nine hundred eighty-six million, six hundred ninety-seven thousand, nine hundred ninety-one".