199651961448 has 96 divisors (see below), whose sum is σ = 548446204800. Its totient is φ = 65601287424.

The previous prime is 199651961441. The next prime is 199651961471. The reversal of 199651961448 is 844169156991.

199651961448 is a `hidden beast` number, since 1 + 9 + 9 + 6 + 5 + 1 + 9 + 614 + 4 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (199651961441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10013233 + ... + 10033151.

It is an arithmetic number, because the mean of its divisors is an integer number (5712981300).

Almost surely, 2^199651961448 is an apocalyptic number.

199651961448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199651961448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274223102400).

199651961448 is an abundant number, since it is smaller than the sum of its proper divisors (348794243352).

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

199651961448 is a wasteful number, since it uses less digits than its factorization.

199651961448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21911 (or 21904 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The spelling of 199651961448 in words is "one hundred ninety-nine billion, six hundred fifty-one million, nine hundred sixty-one thousand, four hundred forty-eight".