31331202066 has 12 divisors (see below), whose sum is σ = 67884271182. Its totient is φ = 10443734016.

The previous prime is 31331202061. The next prime is 31331202073. The reversal of 31331202066 is 66020213313.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31177318041 + 153884025 = 176571^2 + 12405^2 .

It is not an unprimeable number, because it can be changed into a prime (31331202061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 870311151 + ... + 870311186.

Almost surely, 2^31331202066 is an apocalyptic number.

31331202066 is an abundant number, since it is smaller than the sum of its proper divisors (36553069116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31331202066 is a wasteful number, since it uses less digits than its factorization.

31331202066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740622345 (or 1740622342 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31331202066 its reverse (66020213313), we get a palindrome (97351415379).

The spelling of 31331202066 in words is "thirty-one billion, three hundred thirty-one million, two hundred two thousand, sixty-six".