31966640533 has 4 divisors (see below), whose sum is σ = 32569784748. Its totient is φ = 31363496320.

The previous prime is 31966640527. The next prime is 31966640561. The reversal of 31966640533 is 33504666913.

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 25122884004 + 6843756529 = 158502^2 + 82727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31966640533 is a prime.

It is a super-2 number, since 2×31966640533² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31966640033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301572028 + ... + 301572133.

It is an arithmetic number, because the mean of its divisors is an integer number (8142446187).

Almost surely, 2^31966640533 is an apocalyptic number.

It is an amenable number.

31966640533 is a deficient number, since it is larger than the sum of its proper divisors (603144215).

31966640533 is an equidigital number, since it uses as much as digits as its factorization.

31966640533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603144214.

The product of its (nonzero) digits is 1049760, while the sum is 46.

The spelling of 31966640533 in words is "thirty-one billion, nine hundred sixty-six million, six hundred forty thousand, five hundred thirty-three".