82771515085 has 32 divisors (see below), whose sum is σ = 113946739200. Its totient is φ = 56542171392.

The previous prime is 82771515023. The next prime is 82771515097. The reversal of 82771515085 is 58051517728.

It is a de Polignac number, because none of the positive numbers 2^k-82771515085 is a prime.

It is a super-2 number, since 2×82771515085² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16695427 + ... + 16700383.

It is an arithmetic number, because the mean of its divisors is an integer number (3560835600).

Almost surely, 2^82771515085 is an apocalyptic number.

It is an amenable number.

82771515085 is a deficient number, since it is larger than the sum of its proper divisors (31175224115).

82771515085 is a wasteful number, since it uses less digits than its factorization.

82771515085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6685.

The product of its (nonzero) digits is 784000, while the sum is 49.

The spelling of 82771515085 in words is "eighty-two billion, seven hundred seventy-one million, five hundred fifteen thousand, eighty-five".