39355971797 has 2 divisors, whose sum is σ = 39355971798. Its totient is φ = 39355971796.

The previous prime is 39355971793. The next prime is 39355971829. The reversal of 39355971797 is 79717955393.

39355971797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27675982321 + 11679989476 = 166361^2 + 108074^2 .

It is a cyclic number.

It is not a de Polignac number, because 39355971797 - 2² = 39355971793 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39355971793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19677985898 + 19677985899.

It is an arithmetic number, because the mean of its divisors is an integer number (19677985899).

Almost surely, 2^39355971797 is an apocalyptic number.

It is an amenable number.

39355971797 is a deficient number, since it is larger than the sum of its proper divisors (1).

39355971797 is an equidigital number, since it uses as much as digits as its factorization.

39355971797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56260575, while the sum is 65.

The spelling of 39355971797 in words is "thirty-nine billion, three hundred fifty-five million, nine hundred seventy-one thousand, seven hundred ninety-seven".