198756974522 has 4 divisors (see below), whose sum is σ = 298135461786. Its totient is φ = 99378487260.

The previous prime is 198756974447. The next prime is 198756974539. The reversal of 198756974522 is 225479657891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 192528765961 + 6228208561 = 438781^2 + 78919^2 .

It is a super-2 number, since 2×198756974522² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49689243629 + ... + 49689243632.

Almost surely, 2^198756974522 is an apocalyptic number.

198756974522 is a deficient number, since it is larger than the sum of its proper divisors (99378487264).

198756974522 is an equidigital number, since it uses as much as digits as its factorization.

198756974522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99378487263.

The product of its digits is 76204800, while the sum is 65.

The spelling of 198756974522 in words is "one hundred ninety-eight billion, seven hundred fifty-six million, nine hundred seventy-four thousand, five hundred twenty-two".