82420940771 has 4 divisors (see below), whose sum is σ = 88761013152. Its totient is φ = 76080868392.

The previous prime is 82420940747. The next prime is 82420940813. The reversal of 82420940771 is 17704902428.

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 82420940771 - 2²⁶ = 82353831907 is a prime.

It is a super-2 number, since 2×82420940771² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82420940471) 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, 3170036171 + ... + 3170036196.

It is an arithmetic number, because the mean of its divisors is an integer number (22190253288).

Almost surely, 2^82420940771 is an apocalyptic number.

82420940771 is a deficient number, since it is larger than the sum of its proper divisors (6340072381).

82420940771 is a wasteful number, since it uses less digits than its factorization.

82420940771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6340072380.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 82420940771 in words is "eighty-two billion, four hundred twenty million, nine hundred forty thousand, seven hundred seventy-one".