199447721802 has 48 divisors (see below), whose sum is σ = 493933969152. Its totient is φ = 56977745760.

The previous prime is 199447721801. The next prime is 199447721833. The reversal of 199447721802 is 208127744991.

199447721802 is a `hidden beast` number, since 1 + 9 + 94 + 477 + 2 + 1 + 80 + 2 = 666.

It is a super-2 number, since 2×199447721802² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (199447721801) 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, 924408 + ... + 1119564.

It is an arithmetic number, because the mean of its divisors is an integer number (10290291024).

Almost surely, 2^199447721802 is an apocalyptic number.

199447721802 is an abundant number, since it is smaller than the sum of its proper divisors (294486247350).

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

199447721802 is a wasteful number, since it uses less digits than its factorization.

199447721802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203283 (or 203280 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 199447721802 in words is "one hundred ninety-nine billion, four hundred forty-seven million, seven hundred twenty-one thousand, eight hundred two".