199721470564 has 24 divisors (see below), whose sum is σ = 435755936448. Its totient is φ = 77813559840.

The previous prime is 199721470541. The next prime is 199721470567. The reversal of 199721470564 is 465074127991.

It is not an unprimeable number, because it can be changed into a prime (199721470567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324222859 + ... + 324223474.

It is an arithmetic number, because the mean of its divisors is an integer number (18156497352).

Almost surely, 2^199721470564 is an apocalyptic number.

199721470564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

199721470564 is an abundant number, since it is smaller than the sum of its proper divisors (236034465884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199721470564 is a wasteful number, since it uses less digits than its factorization.

199721470564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648446355 (or 648446353 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 199721470564 in words is "one hundred ninety-nine billion, seven hundred twenty-one million, four hundred seventy thousand, five hundred sixty-four".