198251256765 has 8 divisors (see below), whose sum is σ = 317202010848. Its totient is φ = 105734003600.

The previous prime is 198251256751. The next prime is 198251256851. The reversal of 198251256765 is 567652152891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198251256765 - 2¹⁵ = 198251223997 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6608375211 + ... + 6608375240.

It is an arithmetic number, because the mean of its divisors is an integer number (39650251356).

Almost surely, 2^198251256765 is an apocalyptic number.

198251256765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198251256765 is a deficient number, since it is larger than the sum of its proper divisors (118950754083).

198251256765 is a wasteful number, since it uses less digits than its factorization.

198251256765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13216750459.

The product of its digits is 9072000, while the sum is 57.

The spelling of 198251256765 in words is "one hundred ninety-eight billion, two hundred fifty-one million, two hundred fifty-six thousand, seven hundred sixty-five".