31445664198 has 32 divisors (see below), whose sum is σ = 67960329696. Its totient is φ = 9642559488.

The previous prime is 31445664191. The next prime is 31445664199. The reversal of 31445664198 is 89146654413.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31445664198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31445664191) 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 15 ways as a sum of consecutive naturals, for example, 665115 + ... + 710822.

It is an arithmetic number, because the mean of its divisors is an integer number (2123760303).

Almost surely, 2^31445664198 is an apocalyptic number.

31445664198 is an abundant number, since it is smaller than the sum of its proper divisors (36514665498).

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

31445664198 is a wasteful number, since it uses less digits than its factorization.

31445664198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376248.

The product of its digits is 2488320, while the sum is 51.

The spelling of 31445664198 in words is "thirty-one billion, four hundred forty-five million, six hundred sixty-four thousand, one hundred ninety-eight".