39859666649 has 8 divisors (see below), whose sum is σ = 43485631392. Its totient is φ = 36234095040.

The previous prime is 39859666543. The next prime is 39859666657. The reversal of 39859666649 is 94666695893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39859666649 - 2²⁰ = 39858618073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39859666349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138542 + ... + 314504.

It is an arithmetic number, because the mean of its divisors is an integer number (5435703924).

Almost surely, 2^39859666649 is an apocalyptic number.

It is an amenable number.

39859666649 is a deficient number, since it is larger than the sum of its proper divisors (3625964743).

39859666649 is a wasteful number, since it uses less digits than its factorization.

39859666649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196567.

The product of its digits is 453496320, while the sum is 71.

The spelling of 39859666649 in words is "thirty-nine billion, eight hundred fifty-nine million, six hundred sixty-six thousand, six hundred forty-nine".