16661172537445 has 16 divisors (see below), whose sum is σ = 19999550450880. Its totient is φ = 13324842969984.

The previous prime is 16661172537439. The next prime is 16661172537467. The reversal of 16661172537445 is 54473527116661.

16661172537445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16661172537445 - 2³⁹ = 16111416723557 is a prime.

It is a super-2 number, since 2×16661172537445² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16661172537445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345736642 + ... + 345784828.

It is an arithmetic number, because the mean of its divisors is an integer number (1249971903180).

Almost surely, 2^{16661172537445} is an apocalyptic number.

It is an amenable number.

16661172537445 is a deficient number, since it is larger than the sum of its proper divisors (3338377913435).

16661172537445 is a wasteful number, since it uses less digits than its factorization.

16661172537445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68004.

The product of its digits is 25401600, while the sum is 58.

The spelling of 16661172537445 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, five hundred thirty-seven thousand, four hundred forty-five".