31012199966 has 32 divisors (see below), whose sum is σ = 51137412480. Its totient is φ = 13988484000.

The previous prime is 31012199963. The next prime is 31012199971. The reversal of 31012199966 is 66999121013.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31012199966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012199963) 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 15 ways as a sum of consecutive naturals, for example, 1536641 + ... + 1556691.

It is an arithmetic number, because the mean of its divisors is an integer number (1598044140).

Almost surely, 2^31012199966 is an apocalyptic number.

31012199966 is a deficient number, since it is larger than the sum of its proper divisors (20125212514).

31012199966 is a wasteful number, since it uses less digits than its factorization.

31012199966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20600.

The product of its (nonzero) digits is 157464, while the sum is 47.

The spelling of 31012199966 in words is "thirty-one billion, twelve million, one hundred ninety-nine thousand, nine hundred sixty-six".