39866655666893 has 8 divisors (see below), whose sum is σ = 43491722805696. Its totient is φ = 36241726147200.

The previous prime is 39866655666869. The next prime is 39866655667031.

39866655666893 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 39866655666893 - 2²⁰ = 39866654618317 is a prime.

It is a super-2 number, since 2×39866655666893² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39866655696893) 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, 33798596 + ... + 34958237.

It is an arithmetic number, because the mean of its divisors is an integer number (5436465350712).

Almost surely, 2^{39866655666893} is an apocalyptic number.

It is an amenable number.

39866655666893 is a deficient number, since it is larger than the sum of its proper divisors (3625067138803).

39866655666893 is a wasteful number, since it uses less digits than its factorization.

39866655666893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68809555.

The product of its digits is 54419558400, while the sum is 86.

The spelling of 39866655666893 in words is "thirty-nine trillion, eight hundred sixty-six billion, six hundred fifty-five million, six hundred sixty-six thousand, eight hundred ninety-three".