199527948721 has 2 divisors, whose sum is σ = 199527948722. Its totient is φ = 199527948720.

The previous prime is 199527948709. The next prime is 199527948749. The reversal of 199527948721 is 127849725991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113056665121 + 86471283600 = 336239^2 + 294060^2 .

It is a cyclic number.

It is not a de Polignac number, because 199527948721 - 2¹⁹ = 199527424433 is a prime.

It is a super-3 number, since 3×199527948721³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (199527948121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99763974360 + 99763974361.

It is an arithmetic number, because the mean of its divisors is an integer number (99763974361).

Almost surely, 2^199527948721 is an apocalyptic number.

It is an amenable number.

199527948721 is a deficient number, since it is larger than the sum of its proper divisors (1).

199527948721 is an equidigital number, since it uses as much as digits as its factorization.

199527948721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 64.

The spelling of 199527948721 in words is "one hundred ninety-nine billion, five hundred twenty-seven million, nine hundred forty-eight thousand, seven hundred twenty-one".