39196778693 has 2 divisors, whose sum is σ = 39196778694. Its totient is φ = 39196778692.

The previous prime is 39196778657. The next prime is 39196778737. The reversal of 39196778693 is 39687769193.

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., 38806242049 + 390536644 = 196993^2 + 19762^2 .

It is a cyclic number.

It is not a de Polignac number, because 39196778693 - 2¹² = 39196774597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39196777693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19598389346 + 19598389347.

It is an arithmetic number, because the mean of its divisors is an integer number (19598389347).

Almost surely, 2^39196778693 is an apocalyptic number.

It is an amenable number.

39196778693 is a deficient number, since it is larger than the sum of its proper divisors (1).

39196778693 is an equidigital number, since it uses as much as digits as its factorization.

39196778693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 68.

The spelling of 39196778693 in words is "thirty-nine billion, one hundred ninety-six million, seven hundred seventy-eight thousand, six hundred ninety-three".