39664646694 has 24 divisors (see below), whose sum is σ = 85945240992. Its totient is φ = 13220753040.

The previous prime is 39664646689. The next prime is 39664646701. The reversal of 39664646694 is 49664646693.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293892 + ... + 407064.

It is an arithmetic number, because the mean of its divisors is an integer number (3581051708).

Almost surely, 2^39664646694 is an apocalyptic number.

39664646694 is an abundant number, since it is smaller than the sum of its proper divisors (46280594298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39664646694 is a wasteful number, since it uses less digits than its factorization.

39664646694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132652 (or 132649 counting only the distinct ones).

The product of its digits is 120932352, while the sum is 63.

Subtracting 39664646694 from its reverse (49664646693), we obtain a palindrome (9999999999).

The spelling of 39664646694 in words is "thirty-nine billion, six hundred sixty-four million, six hundred forty-six thousand, six hundred ninety-four".