198816470721 has 24 divisors (see below), whose sum is σ = 331715183904. Its totient is φ = 113406898560.

The previous prime is 198816470711. The next prime is 198816470731. The reversal of 198816470721 is 127074618891.

198816470721 is a `hidden beast` number, since 1 + 98 + 8 + 16 + 470 + 72 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (198816470711) and next prime (198816470731).

It is a de Polignac number, because none of the positive numbers 2^k-198816470721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198816470711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59064411 + ... + 59067776.

It is an arithmetic number, because the mean of its divisors is an integer number (13821465996).

Almost surely, 2^198816470721 is an apocalyptic number.

198816470721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198816470721 is a deficient number, since it is larger than the sum of its proper divisors (132898713183).

198816470721 is a wasteful number, since it uses less digits than its factorization.

198816470721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118132221 (or 118132218 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The spelling of 198816470721 in words is "one hundred ninety-eight billion, eight hundred sixteen million, four hundred seventy thousand, seven hundred twenty-one".