39719518697 has 2 divisors, whose sum is σ = 39719518698. Its totient is φ = 39719518696.

The previous prime is 39719518681. The next prime is 39719518757. The reversal of 39719518697 is 79681591793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29920696576 + 9798822121 = 172976^2 + 98989^2 .

It is a cyclic number.

It is not a de Polignac number, because 39719518697 - 2⁴ = 39719518681 is a prime.

It is not a weakly prime, because it can be changed into another prime (39719518637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19859759348 + 19859759349.

It is an arithmetic number, because the mean of its divisors is an integer number (19859759349).

Almost surely, 2^39719518697 is an apocalyptic number.

It is an amenable number.

39719518697 is a deficient number, since it is larger than the sum of its proper divisors (1).

39719518697 is an equidigital number, since it uses as much as digits as its factorization.

39719518697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25719120, while the sum is 65.

The spelling of 39719518697 in words is "thirty-nine billion, seven hundred nineteen million, five hundred eighteen thousand, six hundred ninety-seven".