16661172537444 has 24 divisors (see below), whose sum is σ = 38877207503680. Its totient is φ = 5553561572064.

The previous prime is 16661172537439. The next prime is 16661172537467. The reversal of 16661172537444 is 44473527116661.

It is a super-4 number, since 4×16661172537444⁴ (a number of 54 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19898599 + ... + 20718990.

Almost surely, 2^{16661172537444} is an apocalyptic number.

It is an amenable number.

16661172537444 is an abundant number, since it is smaller than the sum of its proper divisors (22216034966236).

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

16661172537444 is a wasteful number, since it uses less digits than its factorization.

16661172537444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40651779 (or 40651777 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 57.

The spelling of 16661172537444 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, five hundred thirty-seven thousand, four hundred forty-four".