39638155649 has 2 divisors, whose sum is σ = 39638155650. Its totient is φ = 39638155648.

The previous prime is 39638155619. The next prime is 39638155681. The reversal of 39638155649 is 94655183693.

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., 37434510400 + 2203645249 = 193480^2 + 46943^2 .

It is a cyclic number.

It is not a de Polignac number, because 39638155649 - 2⁸ = 39638155393 is a prime.

It is a super-2 number, since 2×39638155649² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39638155619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19819077824 + 19819077825.

It is an arithmetic number, because the mean of its divisors is an integer number (19819077825).

Almost surely, 2^39638155649 is an apocalyptic number.

It is an amenable number.

39638155649 is a deficient number, since it is larger than the sum of its proper divisors (1).

39638155649 is an equidigital number, since it uses as much as digits as its factorization.

39638155649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20995200, while the sum is 59.

The spelling of 39638155649 in words is "thirty-nine billion, six hundred thirty-eight million, one hundred fifty-five thousand, six hundred forty-nine".