198638252254 has 16 divisors (see below), whose sum is σ = 321397262928. Its totient is φ = 91530597312.

The previous prime is 198638252243. The next prime is 198638252287. The reversal of 198638252254 is 452252836891.

It is a junction number, because it is equal to n+sod(n) for n = 198638252195 and 198638252204.

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, 6175152 + ... + 6207235.

It is an arithmetic number, because the mean of its divisors is an integer number (20087328933).

Almost surely, 2^198638252254 is an apocalyptic number.

198638252254 is a deficient number, since it is larger than the sum of its proper divisors (122759010674).

198638252254 is a wasteful number, since it uses less digits than its factorization.

198638252254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12383019.

The product of its digits is 8294400, while the sum is 55.

The spelling of 198638252254 in words is "one hundred ninety-eight billion, six hundred thirty-eight million, two hundred fifty-two thousand, two hundred fifty-four".