16661172206442 has 16 divisors (see below), whose sum is σ = 33334933165632. Its totient is φ = 5551625943360.

The previous prime is 16661172206411. The next prime is 16661172206453. The reversal of 16661172206442 is 24460227116661.

It is a junction number, because it is equal to n+sod(n) for n = 16661172206391 and 16661172206400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524514159 + ... + 524545922.

It is an arithmetic number, because the mean of its divisors is an integer number (2083433322852).

Almost surely, 2^{16661172206442} is an apocalyptic number.

16661172206442 is an abundant number, since it is smaller than the sum of its proper divisors (16673760959190).

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

16661172206442 is a wasteful number, since it uses less digits than its factorization.

16661172206442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049062733.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 16661172206442 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, two hundred six thousand, four hundred forty-two".