85665012378 has 32 divisors (see below), whose sum is σ = 196742615040. Its totient is φ = 24592826160.

The previous prime is 85665012373. The next prime is 85665012383. The reversal of 85665012378 is 87321056658.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (85665012373) and next prime (85665012383).

It is a self number, because there is not a number n which added to its sum of digits gives 85665012378.

It is not an unprimeable number, because it can be changed into a prime (85665012373) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 34155450 + ... + 34157957.

It is an arithmetic number, because the mean of its divisors is an integer number (6148206720).

Almost surely, 2^85665012378 is an apocalyptic number.

85665012378 is an abundant number, since it is smaller than the sum of its proper divisors (111077602662).

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

85665012378 is a wasteful number, since it uses less digits than its factorization.

85665012378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68313442.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 85665012378 in words is "eighty-five billion, six hundred sixty-five million, twelve thousand, three hundred seventy-eight".