199972750906 has 8 divisors (see below), whose sum is σ = 302613632244. Its totient is φ = 99101540160.

The previous prime is 199972750903. The next prime is 199972750921. The reversal of 199972750906 is 609057279991.

199972750906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 199264924881 + 707826025 = 446391^2 + 26605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×199972750906² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199972750903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442417365 + ... + 442417816.

Almost surely, 2^199972750906 is an apocalyptic number.

199972750906 is a deficient number, since it is larger than the sum of its proper divisors (102640881338).

199972750906 is a wasteful number, since it uses less digits than its factorization.

199972750906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884835296.

The product of its (nonzero) digits is 19289340, while the sum is 64.

The spelling of 199972750906 in words is "one hundred ninety-nine billion, nine hundred seventy-two million, seven hundred fifty thousand, nine hundred six".