78192644891 has 2 divisors, whose sum is σ = 78192644892. Its totient is φ = 78192644890.

The previous prime is 78192644879. The next prime is 78192644923. The reversal of 78192644891 is 19844629187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78192644891 - 2³⁰ = 77118903067 is a prime.

It is a super-2 number, since 2×78192644891² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78192644891.

It is not a weakly prime, because it can be changed into another prime (78192644851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39096322445 + 39096322446.

It is an arithmetic number, because the mean of its divisors is an integer number (39096322446).

Almost surely, 2^78192644891 is an apocalyptic number.

78192644891 is a deficient number, since it is larger than the sum of its proper divisors (1).

78192644891 is an equidigital number, since it uses as much as digits as its factorization.

78192644891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 59.

The spelling of 78192644891 in words is "seventy-eight billion, one hundred ninety-two million, six hundred forty-four thousand, eight hundred ninety-one".