198251256766 has 4 divisors (see below), whose sum is σ = 297376885152. Its totient is φ = 99125628382.

The previous prime is 198251256751. The next prime is 198251256851. The reversal of 198251256766 is 667652152891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 198251256766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49562814190 + ... + 49562814193.

It is an arithmetic number, because the mean of its divisors is an integer number (74344221288).

Almost surely, 2^198251256766 is an apocalyptic number.

198251256766 is a deficient number, since it is larger than the sum of its proper divisors (99125628386).

198251256766 is an equidigital number, since it uses as much as digits as its factorization.

198251256766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99125628385.

The product of its digits is 10886400, while the sum is 58.

The spelling of 198251256766 in words is "one hundred ninety-eight billion, two hundred fifty-one million, two hundred fifty-six thousand, seven hundred sixty-six".