78766213867597 has 2 divisors, whose sum is σ = 78766213867598. Its totient is φ = 78766213867596.

The previous prime is 78766213867571. The next prime is 78766213867619. The reversal of 78766213867597 is 79576831266787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78737032345321 + 29181522276 = 8873389^2 + 170826^2 .

It is a cyclic number.

It is not a de Polignac number, because 78766213867597 - 2¹⁵ = 78766213834829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78766213867597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78766213867097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39383106933798 + 39383106933799.

It is an arithmetic number, because the mean of its divisors is an integer number (39383106933799).

Almost surely, 2^{78766213867597} is an apocalyptic number.

It is an amenable number.

78766213867597 is a deficient number, since it is larger than the sum of its proper divisors (1).

78766213867597 is an equidigital number, since it uses as much as digits as its factorization.

78766213867597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8961684480, while the sum is 82.

The spelling of 78766213867597 in words is "seventy-eight trillion, seven hundred sixty-six billion, two hundred thirteen million, eight hundred sixty-seven thousand, five hundred ninety-seven".