31325683666 has 4 divisors (see below), whose sum is σ = 46988525502. Its totient is φ = 15662841832.

The previous prime is 31325683661. The next prime is 31325683769. The reversal of 31325683666 is 66638652313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66638652313 = 6173 ⋅10795181.

It can be written as a sum of positive squares in only one way, i.e., 19215781641 + 12109902025 = 138621^2 + 110045^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (31325683661) 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 as a sum of consecutive naturals, namely, 7831420915 + ... + 7831420918.

Almost surely, 2^31325683666 is an apocalyptic number.

31325683666 is a deficient number, since it is larger than the sum of its proper divisors (15662841836).

31325683666 is a wasteful number, since it uses less digits than its factorization.

31325683666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15662841835.

The product of its digits is 2799360, while the sum is 49.

The spelling of 31325683666 in words is "thirty-one billion, three hundred twenty-five million, six hundred eighty-three thousand, six hundred sixty-six".