78619688729 has 2 divisors, whose sum is σ = 78619688730. Its totient is φ = 78619688728.

The previous prime is 78619688699. The next prime is 78619688743. The reversal of 78619688729 is 92788691687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67662414400 + 10957274329 = 260120^2 + 104677^2 .

It is a cyclic number.

It is not a de Polignac number, because 78619688729 - 2¹⁶ = 78619623193 is a prime.

It is not a weakly prime, because it can be changed into another prime (78619688759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39309844364 + 39309844365.

It is an arithmetic number, because the mean of its divisors is an integer number (39309844365).

Almost surely, 2^78619688729 is an apocalyptic number.

It is an amenable number.

78619688729 is a deficient number, since it is larger than the sum of its proper divisors (1).

78619688729 is an equidigital number, since it uses as much as digits as its factorization.

78619688729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146313216, while the sum is 71.

The spelling of 78619688729 in words is "seventy-eight billion, six hundred nineteen million, six hundred eighty-eight thousand, seven hundred twenty-nine".