78912120212011 has 32 divisors (see below), whose sum is σ = 81898344777600. Its totient is φ = 75999589632000.

The previous prime is 78912120211963. The next prime is 78912120212021. The reversal of 78912120212011 is 11021202121987.

It is a de Polignac number, because none of the positive numbers 2^k-78912120212011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78912120212021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 465064515 + ... + 465234163.

It is an arithmetic number, because the mean of its divisors is an integer number (2559323274300).

Almost surely, 2^{78912120212011} is an apocalyptic number.

78912120212011 is a deficient number, since it is larger than the sum of its proper divisors (2986224565589).

78912120212011 is a wasteful number, since it uses less digits than its factorization.

78912120212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170647.

The product of its (nonzero) digits is 8064, while the sum is 37.

Adding to 78912120212011 its reverse (11021202121987), we get a palindrome (89933322333998).

The spelling of 78912120212011 in words is "seventy-eight trillion, nine hundred twelve billion, one hundred twenty million, two hundred twelve thousand, eleven".