39686131054877 has 4 divisors (see below), whose sum is σ = 39686187468060. Its totient is φ = 39686074641696.

The previous prime is 39686131054873. The next prime is 39686131054879. The reversal of 39686131054877 is 77845013168693.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20626366723876 + 19059764331001 = 4541626^2 + 4365749^2 .

It is a cyclic number.

It is not a de Polignac number, because 39686131054877 - 2² = 39686131054873 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 (39686131054873) 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, 27137858 + ... + 28562835.

It is an arithmetic number, because the mean of its divisors is an integer number (9921546867015).

Almost surely, 2^{39686131054877} is an apocalyptic number.

It is an amenable number.

39686131054877 is a deficient number, since it is larger than the sum of its proper divisors (56413183).

39686131054877 is an equidigital number, since it uses as much as digits as its factorization.

39686131054877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56413182.

The product of its (nonzero) digits is 182891520, while the sum is 68.

The spelling of 39686131054877 in words is "thirty-nine trillion, six hundred eighty-six billion, one hundred thirty-one million, fifty-four thousand, eight hundred seventy-seven".