78111211187 has 4 divisors (see below), whose sum is σ = 78175395816. Its totient is φ = 78047026560.

The previous prime is 78111211177. The next prime is 78111211207.

It is a happy number.

78111211187 is nontrivially palindromic in base 10.

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 78111211187 - 2¹² = 78111207091 is a prime.

It is a super-2 number, since 2×78111211187² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78111211187.

It is not an unprimeable number, because it can be changed into a prime (78111211127) 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, 32090489 + ... + 32092922.

It is an arithmetic number, because the mean of its divisors is an integer number (19543848954).

Almost surely, 2^78111211187 is an apocalyptic number.

78111211187 is a deficient number, since it is larger than the sum of its proper divisors (64184629).

78111211187 is a wasteful number, since it uses less digits than its factorization.

78111211187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64184628.

The product of its digits is 6272, while the sum is 38.

The spelling of 78111211187 in words is "seventy-eight billion, one hundred eleven million, two hundred eleven thousand, one hundred eighty-seven".