78066797 has 2 divisors, whose sum is σ = 78066798. Its totient is φ = 78066796.

The previous prime is 78066767. The next prime is 78066809. The reversal of 78066797 is 79766087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76930441 + 1136356 = 8771^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 78066797 - 2¹⁰ = 78065773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78066727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39033398 + 39033399.

It is an arithmetic number, because the mean of its divisors is an integer number (39033399).

Almost surely, 2^78066797 is an apocalyptic number.

It is an amenable number.

78066797 is a deficient number, since it is larger than the sum of its proper divisors (1).

78066797 is an equidigital number, since it uses as much as digits as its factorization.

78066797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 889056, while the sum is 50.

The square root of 78066797 is about 8835.5416925053. The cubic root of 78066797 is about 427.3877995164.

The spelling of 78066797 in words is "seventy-eight million, sixty-six thousand, seven hundred ninety-seven".