78668831737 has 2 divisors, whose sum is σ = 78668831738. Its totient is φ = 78668831736.

The previous prime is 78668831707. The next prime is 78668831741. The reversal of 78668831737 is 73713886687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45592498576 + 33076333161 = 213524^2 + 181869^2 .

It is a cyclic number.

It is not a de Polignac number, because 78668831737 - 2¹⁵ = 78668798969 is a prime.

It is not a weakly prime, because it can be changed into another prime (78668831707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39334415868 + 39334415869.

It is an arithmetic number, because the mean of its divisors is an integer number (39334415869).

Almost surely, 2^78668831737 is an apocalyptic number.

It is an amenable number.

78668831737 is a deficient number, since it is larger than the sum of its proper divisors (1).

78668831737 is an equidigital number, since it uses as much as digits as its factorization.

78668831737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56899584, while the sum is 64.

The spelling of 78668831737 in words is "seventy-eight billion, six hundred sixty-eight million, eight hundred thirty-one thousand, seven hundred thirty-seven".