31966530197861 has 4 divisors (see below), whose sum is σ = 36533177368992. Its totient is φ = 27399883026732.

The previous prime is 31966530197843. The next prime is 31966530197867. The reversal of 31966530197861 is 16879103566913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31966530197861 - 2¹⁰ = 31966530196837 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 (31966530197867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2283323585555 + ... + 2283323585568.

It is an arithmetic number, because the mean of its divisors is an integer number (9133294342248).

Almost surely, 2^{31966530197861} is an apocalyptic number.

It is an amenable number.

31966530197861 is a deficient number, since it is larger than the sum of its proper divisors (4566647171131).

31966530197861 is an equidigital number, since it uses as much as digits as its factorization.

31966530197861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4566647171130.

The product of its (nonzero) digits is 44089920, while the sum is 65.

The spelling of 31966530197861 in words is "thirty-one trillion, nine hundred sixty-six billion, five hundred thirty million, one hundred ninety-seven thousand, eight hundred sixty-one".