198257078451 has 8 divisors (see below), whose sum is σ = 264347345344. Its totient is φ = 132169098600.

The previous prime is 198257078413. The next prime is 198257078521. The reversal of 198257078451 is 154870752891.

It is a happy number.

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

It is not a de Polignac number, because 198257078451 - 2¹⁷ = 198256947379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198257078391 and 198257078400.

It is not an unprimeable number, because it can be changed into a prime (198257088451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358081 + ... + 724386.

It is an arithmetic number, because the mean of its divisors is an integer number (33043418168).

Almost surely, 2^198257078451 is an apocalyptic number.

198257078451 is a deficient number, since it is larger than the sum of its proper divisors (66090266893).

198257078451 is a wasteful number, since it uses less digits than its factorization.

198257078451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143521.

The product of its (nonzero) digits is 5644800, while the sum is 57.

The spelling of 198257078451 in words is "one hundred ninety-eight billion, two hundred fifty-seven million, seventy-eight thousand, four hundred fifty-one".