198978688653 has 16 divisors (see below), whose sum is σ = 269431056576. Its totient is φ = 130596036480.

The previous prime is 198978688577. The next prime is 198978688661. The reversal of 198978688653 is 356886879891.

198978688653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198978688653 - 2⁹ = 198978688141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198978688453) 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, 710718 + ... + 950303.

It is an arithmetic number, because the mean of its divisors is an integer number (16839441036).

Almost surely, 2^198978688653 is an apocalyptic number.

It is an amenable number.

198978688653 is a deficient number, since it is larger than the sum of its proper divisors (70452367923).

198978688653 is a wasteful number, since it uses less digits than its factorization.

198978688653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661644.

The product of its digits is 1254113280, while the sum is 78.

The spelling of 198978688653 in words is "one hundred ninety-eight billion, nine hundred seventy-eight million, six hundred eighty-eight thousand, six hundred fifty-three".