82842821985 has 64 divisors (see below), whose sum is σ = 165523691520. Its totient is φ = 34372270080.

The previous prime is 82842821981. The next prime is 82842822017. The reversal of 82842821985 is 58912824828.

It is a happy number.

It is not a de Polignac number, because 82842821985 - 2² = 82842821981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82842821981) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 657009 + ... + 772881.

It is an arithmetic number, because the mean of its divisors is an integer number (2586307680).

Almost surely, 2^82842821985 is an apocalyptic number.

It is an amenable number.

82842821985 is a deficient number, since it is larger than the sum of its proper divisors (82680869535).

82842821985 is a wasteful number, since it uses less digits than its factorization.

82842821985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116518.

The product of its digits is 5898240, while the sum is 57.

The spelling of 82842821985 in words is "eighty-two billion, eight hundred forty-two million, eight hundred twenty-one thousand, nine hundred eighty-five".