82699777281 has 16 divisors (see below), whose sum is σ = 124170928128. Its totient is φ = 48504267600.

The previous prime is 82699777267. The next prime is 82699777289. The reversal of 82699777281 is 18277799628.

It is not a de Polignac number, because 82699777281 - 2¹¹ = 82699775233 is a prime.

It is a super-2 number, since 2×82699777281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82699777289) 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, 40419201 + ... + 40421246.

It is an arithmetic number, because the mean of its divisors is an integer number (7760683008).

Almost surely, 2^82699777281 is an apocalyptic number.

It is an amenable number.

82699777281 is a deficient number, since it is larger than the sum of its proper divisors (41471150847).

82699777281 is a wasteful number, since it uses less digits than its factorization.

82699777281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80840492.

The product of its digits is 42674688, while the sum is 66.

The spelling of 82699777281 in words is "eighty-two billion, six hundred ninety-nine million, seven hundred seventy-seven thousand, two hundred eighty-one".