78840646639611 has 16 divisors (see below), whose sum is σ = 105700377897600. Its totient is φ = 52271334033408.

The previous prime is 78840646639607. The next prime is 78840646639631. The reversal of 78840646639611 is 11693664604887.

It is not a de Polignac number, because 78840646639611 - 2² = 78840646639607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78840646639631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82121821 + ... + 83076318.

It is an arithmetic number, because the mean of its divisors is an integer number (6606273618600).

Almost surely, 2^{78840646639611} is an apocalyptic number.

78840646639611 is a deficient number, since it is larger than the sum of its proper divisors (26859731257989).

78840646639611 is a wasteful number, since it uses less digits than its factorization.

78840646639611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165199018.

The product of its (nonzero) digits is 250822656, while the sum is 69.

The spelling of 78840646639611 in words is "seventy-eight trillion, eight hundred forty billion, six hundred forty-six million, six hundred thirty-nine thousand, six hundred eleven".