78464736697 has 2 divisors, whose sum is σ = 78464736698. Its totient is φ = 78464736696.

The previous prime is 78464736619. The next prime is 78464736737. The reversal of 78464736697 is 79663746487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39673070761 + 38791665936 = 199181^2 + 196956^2 .

It is a cyclic number.

It is not a de Polignac number, because 78464736697 - 2¹⁵ = 78464703929 is a prime.

It is not a weakly prime, because it can be changed into another prime (78464739697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39232368348 + 39232368349.

It is an arithmetic number, because the mean of its divisors is an integer number (39232368349).

Almost surely, 2^78464736697 is an apocalyptic number.

It is an amenable number.

78464736697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78464736697 is an equidigital number, since it uses as much as digits as its factorization.

78464736697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256048128, while the sum is 67.

The spelling of 78464736697 in words is "seventy-eight billion, four hundred sixty-four million, seven hundred thirty-six thousand, six hundred ninety-seven".