78190074889 has 2 divisors, whose sum is σ = 78190074890. Its totient is φ = 78190074888.

The previous prime is 78190074883. The next prime is 78190074901. The reversal of 78190074889 is 98847009187.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41428531600 + 36761543289 = 203540^2 + 191733^2 .

It is a cyclic number.

It is not a de Polignac number, because 78190074889 - 2⁷ = 78190074761 is a prime.

It is a super-2 number, since 2×78190074889² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78190074883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39095037444 + 39095037445.

It is an arithmetic number, because the mean of its divisors is an integer number (39095037445).

Almost surely, 2^78190074889 is an apocalyptic number.

It is an amenable number.

78190074889 is a deficient number, since it is larger than the sum of its proper divisors (1).

78190074889 is an equidigital number, since it uses as much as digits as its factorization.

78190074889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 61.

The spelling of 78190074889 in words is "seventy-eight billion, one hundred ninety million, seventy-four thousand, eight hundred eighty-nine".