39786666668887 has 4 divisors (see below), whose sum is σ = 39786681870640. Its totient is φ = 39786651467136.

The previous prime is 39786666668851. The next prime is 39786666668891. The reversal of 39786666668887 is 78886666668793.

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-39786666668887 is a prime.

It is a super-2 number, since 2×39786666668887² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39786666668795 and 39786666668804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39786666665887) 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, 2561163 + ... + 9280780.

It is an arithmetic number, because the mean of its divisors is an integer number (9946670467660).

Almost surely, 2^{39786666668887} is an apocalyptic number.

39786666668887 is a deficient number, since it is larger than the sum of its proper divisors (15201753).

39786666668887 is a wasteful number, since it uses less digits than its factorization.

39786666668887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15201752.

The product of its digits is 252829237248, while the sum is 94.

Subtracting from 39786666668887 its sum of digits (94), we obtain a palindrome (39786666668793).

The spelling of 39786666668887 in words is "thirty-nine trillion, seven hundred eighty-six billion, six hundred sixty-six million, six hundred sixty-eight thousand, eight hundred eighty-seven".