68440082085 has 40 divisors (see below), whose sum is σ = 122733288216. Its totient is φ = 36487065600.

The previous prime is 68440082057. The next prime is 68440082101. The reversal of 68440082085 is 58028004486.

It can be written as a sum of positive squares in 4 ways, for example, as 23901778404 + 44538303681 = 154602^2 + 211041^2 .

It is not a de Polignac number, because 68440082085 - 2²⁴ = 68423304869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 68440082085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1044285 + ... + 1107885.

Almost surely, 2^68440082085 is an apocalyptic number.

It is an amenable number.

68440082085 is a deficient number, since it is larger than the sum of its proper divisors (54293206131).

68440082085 is a wasteful number, since it uses less digits than its factorization.

68440082085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66275 (or 66266 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 45.

The spelling of 68440082085 in words is "sixty-eight billion, four hundred forty million, eighty-two thousand, eighty-five".