78228446832665 has 16 divisors (see below), whose sum is σ = 95646146612688. Its totient is φ = 61401436951296.

The previous prime is 78228446832617. The next prime is 78228446832713. The reversal of 78228446832665 is 56623864482287.

It is an interprime number because it is at equal distance from previous prime (78228446832617) and next prime (78228446832713).

It can be written as a sum of positive squares in 8 ways, for example, as 3948232584256 + 74280214248409 = 1987016^2 + 8618597^2 .

It is a cyclic number.

It is not a de Polignac number, because 78228446832665 - 2²² = 78228442638361 is a prime.

It is a super-2 number, since 2×78228446832665² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32200187 + ... + 34544303.

It is an arithmetic number, because the mean of its divisors is an integer number (5977884163293).

Almost surely, 2^{78228446832665} is an apocalyptic number.

It is an amenable number.

78228446832665 is a deficient number, since it is larger than the sum of its proper divisors (17417699780023).

78228446832665 is a wasteful number, since it uses less digits than its factorization.

78228446832665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470108.

The product of its digits is 1486356480, while the sum is 71.

The spelling of 78228446832665 in words is "seventy-eight trillion, two hundred twenty-eight billion, four hundred forty-six million, eight hundred thirty-two thousand, six hundred sixty-five".