78161189779 has 2 divisors, whose sum is σ = 78161189780. Its totient is φ = 78161189778.

The previous prime is 78161189747. The next prime is 78161189783. The reversal of 78161189779 is 97798116187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78161189779 - 2⁵ = 78161189747 is a prime.

It is a super-2 number, since 2×78161189779² (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 78161189779.

It is not a weakly prime, because it can be changed into another prime (78161189879) 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 as a sum of consecutive naturals, namely, 39080594889 + 39080594890.

It is an arithmetic number, because the mean of its divisors is an integer number (39080594890).

Almost surely, 2^78161189779 is an apocalyptic number.

78161189779 is a deficient number, since it is larger than the sum of its proper divisors (1).

78161189779 is an equidigital number, since it uses as much as digits as its factorization.

78161189779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10668672, while the sum is 64.

The spelling of 78161189779 in words is "seventy-eight billion, one hundred sixty-one million, one hundred eighty-nine thousand, seven hundred seventy-nine".