198655621264 has 15 divisors (see below), whose sum is σ = 384898720467. Its totient is φ = 99326919216.

The previous prime is 198655621261. The next prime is 198655621301. The reversal of 198655621264 is 462126556891.

It is a happy number.

The square root of 198655621264 is 445708.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198655621261) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1727119 + ... + 1838545.

Almost surely, 2^198655621264 is an apocalyptic number.

198655621264 is the 445708-th square number.

It is an amenable number.

198655621264 is a deficient number, since it is larger than the sum of its proper divisors (186243099203).

198655621264 is an frugal number, since it uses more digits than its factorization.

198655621264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222862 (or 111429 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 55.

The spelling of 198655621264 in words is "one hundred ninety-eight billion, six hundred fifty-five million, six hundred twenty-one thousand, two hundred sixty-four".