31660138316039 has 4 divisors (see below), whose sum is σ = 32515817730024. Its totient is φ = 30804458902056.

The previous prime is 31660138315979. The next prime is 31660138316057. The reversal of 31660138316039 is 93061383106613.

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

It is a cyclic number.

It is not a de Polignac number, because 31660138316039 - 2¹² = 31660138311943 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 (31660138316099) 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, 427839706937 + ... + 427839707010.

It is an arithmetic number, because the mean of its divisors is an integer number (8128954432506).

Almost surely, 2^{31660138316039} is an apocalyptic number.

31660138316039 is a deficient number, since it is larger than the sum of its proper divisors (855679413985).

31660138316039 is an equidigital number, since it uses as much as digits as its factorization.

31660138316039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855679413984.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 31660138316039 in words is "thirty-one trillion, six hundred sixty billion, one hundred thirty-eight million, three hundred sixteen thousand, thirty-nine".