39964159745 has 4 divisors (see below), whose sum is σ = 47956991700. Its totient is φ = 31971327792.

The previous prime is 39964159673. The next prime is 39964159747. The reversal of 39964159745 is 54795146993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29104018801 + 10860140944 = 170599^2 + 104212^2 .

It is a cyclic number.

It is not a de Polignac number, because 39964159745 - 2⁸ = 39964159489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39964159747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3996415970 + ... + 3996415979.

It is an arithmetic number, because the mean of its divisors is an integer number (11989247925).

Almost surely, 2^39964159745 is an apocalyptic number.

It is an amenable number.

39964159745 is a deficient number, since it is larger than the sum of its proper divisors (7992831955).

39964159745 is an equidigital number, since it uses as much as digits as its factorization.

39964159745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7992831954.

The product of its digits is 36741600, while the sum is 62.

The spelling of 39964159745 in words is "thirty-nine billion, nine hundred sixty-four million, one hundred fifty-nine thousand, seven hundred forty-five".