82020779905 has 16 divisors (see below), whose sum is σ = 100293603840. Its totient is φ = 64371131968.

The previous prime is 82020779899. The next prime is 82020779909. The reversal of 82020779905 is 50997702028.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82020779905 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82020779909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3868764 + ... + 3889906.

It is an arithmetic number, because the mean of its divisors is an integer number (6268350240).

Almost surely, 2^82020779905 is an apocalyptic number.

It is an amenable number.

82020779905 is a deficient number, since it is larger than the sum of its proper divisors (18272823935).

82020779905 is a wasteful number, since it uses less digits than its factorization.

82020779905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35840.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 82020779905 in words is "eighty-two billion, twenty million, seven hundred seventy-nine thousand, nine hundred five".