78656442211 has 4 divisors (see below), whose sum is σ = 78661248624. Its totient is φ = 78651635800.

The previous prime is 78656442209. The next prime is 78656442247. The reversal of 78656442211 is 11224465687.

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

It is a cyclic number.

It is not a de Polignac number, because 78656442211 - 2¹ = 78656442209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78656442311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2378575 + ... + 2411416.

It is an arithmetic number, because the mean of its divisors is an integer number (19665312156).

Almost surely, 2^78656442211 is an apocalyptic number.

78656442211 is a deficient number, since it is larger than the sum of its proper divisors (4806413).

78656442211 is a wasteful number, since it uses less digits than its factorization.

78656442211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806412.

The product of its digits is 645120, while the sum is 46.

The spelling of 78656442211 in words is "seventy-eight billion, six hundred fifty-six million, four hundred forty-two thousand, two hundred eleven".