85665533240 has 128 divisors (see below), whose sum is σ = 225249085440. Its totient is φ = 28710429696.

The previous prime is 85665533227. The next prime is 85665533251. The reversal of 85665533240 is 4233556658.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11932532 + ... + 11939708.

It is an arithmetic number, because the mean of its divisors is an integer number (1759758480).

Almost surely, 2^85665533240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85665533240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112624542720).

85665533240 is an abundant number, since it is smaller than the sum of its proper divisors (139583552200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85665533240 is a wasteful number, since it uses less digits than its factorization.

85665533240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8149 (or 8145 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 85665533240 in words is "eighty-five billion, six hundred sixty-five million, five hundred thirty-three thousand, two hundred forty".