78662465213 has 2 divisors, whose sum is σ = 78662465214. Its totient is φ = 78662465212.

The previous prime is 78662465207. The next prime is 78662465239. The reversal of 78662465213 is 31256426687.

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., 57620641849 + 21041823364 = 240043^2 + 145058^2 .

It is a cyclic number.

It is not a de Polignac number, because 78662465213 - 2⁴ = 78662465197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78662465293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39331232606 + 39331232607.

It is an arithmetic number, because the mean of its divisors is an integer number (39331232607).

Almost surely, 2^78662465213 is an apocalyptic number.

It is an amenable number.

78662465213 is a deficient number, since it is larger than the sum of its proper divisors (1).

78662465213 is an equidigital number, since it uses as much as digits as its factorization.

78662465213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 50.

The spelling of 78662465213 in words is "seventy-eight billion, six hundred sixty-two million, four hundred sixty-five thousand, two hundred thirteen".