78012122011 has 4 divisors (see below), whose sum is σ = 78028651224. Its totient is φ = 77995592800.

The previous prime is 78012122009. The next prime is 78012122087. The reversal of 78012122011 is 11022121087.

It is a happy number.

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 78012122011 - 2¹ = 78012122009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78012122611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8257525 + ... + 8266966.

It is an arithmetic number, because the mean of its divisors is an integer number (19507162806).

Almost surely, 2^78012122011 is an apocalyptic number.

78012122011 is a deficient number, since it is larger than the sum of its proper divisors (16529213).

78012122011 is a wasteful number, since it uses less digits than its factorization.

78012122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16529212.

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 78012122011 its reverse (11022121087), we get a palindrome (89034243098).

The spelling of 78012122011 in words is "seventy-eight billion, twelve million, one hundred twenty-two thousand, eleven".