78466165665611 has 4 divisors (see below), whose sum is σ = 78473136109992. Its totient is φ = 78459195221232.

The previous prime is 78466165665571. The next prime is 78466165665617. The reversal of 78466165665611 is 11656656166487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78466165665611 is a prime.

It is a super-2 number, since 2×78466165665611² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78466165665617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3485205305 + ... + 3485227818.

It is an arithmetic number, because the mean of its divisors is an integer number (19618284027498).

Almost surely, 2^{78466165665611} is an apocalyptic number.

78466165665611 is a deficient number, since it is larger than the sum of its proper divisors (6970444381).

78466165665611 is a wasteful number, since it uses less digits than its factorization.

78466165665611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6970444380.

The product of its digits is 261273600, while the sum is 68.

The spelling of 78466165665611 in words is "seventy-eight trillion, four hundred sixty-six billion, one hundred sixty-five million, six hundred sixty-five thousand, six hundred eleven".