39964778743 has 2 divisors, whose sum is σ = 39964778744. Its totient is φ = 39964778742.

The previous prime is 39964778723. The next prime is 39964778761. The reversal of 39964778743 is 34787746993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39964778743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39964778723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19982389371 + 19982389372.

It is an arithmetic number, because the mean of its divisors is an integer number (19982389372).

Almost surely, 2^39964778743 is an apocalyptic number.

39964778743 is a deficient number, since it is larger than the sum of its proper divisors (1).

39964778743 is an equidigital number, since it uses as much as digits as its factorization.

39964778743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192036096, while the sum is 67.

The spelling of 39964778743 in words is "thirty-nine billion, nine hundred sixty-four million, seven hundred seventy-eight thousand, seven hundred forty-three".