39965964664447 has 4 divisors (see below), whose sum is σ = 39966000896056. Its totient is φ = 39965928432840.

The previous prime is 39965964664429. The next prime is 39965964664519. The reversal of 39965964664447 is 74446646956993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39965964664447 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 (39965964668447) 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, 16407504 + ... + 18685237.

It is an arithmetic number, because the mean of its divisors is an integer number (9991500224014).

Almost surely, 2^{39965964664447} is an apocalyptic number.

39965964664447 is a deficient number, since it is larger than the sum of its proper divisors (36231609).

39965964664447 is a wasteful number, since it uses less digits than its factorization.

39965964664447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36231608.

The product of its digits is 25395793920, while the sum is 82.

The spelling of 39965964664447 in words is "thirty-nine trillion, nine hundred sixty-five billion, nine hundred sixty-four million, six hundred sixty-four thousand, four hundred forty-seven".