198509713974164 has 6 divisors (see below), whose sum is σ = 347391999454794. Its totient is φ = 99254856987080.

The previous prime is 198509713974133. The next prime is 198509713974193. The reversal of 198509713974164 is 461479317905891.

It can be written as a sum of positive squares in only one way, i.e., 181164654706564 + 17345059267600 = 13459742^2 + 4164740^2 .

It is a super-2 number, since 2×198509713974164² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 198509713974091 and 198509713974100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24813714246767 + ... + 24813714246774.

It is an arithmetic number, because the mean of its divisors is an integer number (57898666575799).

Almost surely, 2^{198509713974164} is an apocalyptic number.

It is an amenable number.

198509713974164 is a deficient number, since it is larger than the sum of its proper divisors (148882285480630).

198509713974164 is a wasteful number, since it uses less digits than its factorization.

198509713974164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49627428493545 (or 49627428493543 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 74.

The spelling of 198509713974164 in words is "one hundred ninety-eight trillion, five hundred nine billion, seven hundred thirteen million, nine hundred seventy-four thousand, one hundred sixty-four".