39661625709 has 6 divisors (see below), whose sum is σ = 57289014926. Its totient is φ = 26441083800.

The previous prime is 39661625687. The next prime is 39661625741. The reversal of 39661625709 is 90752616693.

39661625709 is a `hidden beast` number, since 3 + 9 + 6 + 6 + 1 + 62 + 570 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19927557225 + 19734068484 = 141165^2 + 140478^2 .

It is not a de Polignac number, because 39661625709 - 2¹⁷ = 39661494637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39661625749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2203423642 + ... + 2203423659.

Almost surely, 2^39661625709 is an apocalyptic number.

It is an amenable number.

39661625709 is a deficient number, since it is larger than the sum of its proper divisors (17627389217).

39661625709 is a wasteful number, since it uses less digits than its factorization.

39661625709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406847307 (or 4406847304 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

The spelling of 39661625709 in words is "thirty-nine billion, six hundred sixty-one million, six hundred twenty-five thousand, seven hundred nine".