16623493881444 has 30 divisors (see below), whose sum is σ = 43457096660054. Its totient is φ = 5541164627040.

The previous prime is 16623493881377. The next prime is 16623493881559. The reversal of 16623493881444 is 44418839432661.

16623493881444 is a `hidden beast` number, since 1 + 6 + 6 + 23 + 4 + 93 + 8 + 81 + 444 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11295568148544 + 5327925732900 = 3360888^2 + 2308230^2 .

It is a super-2 number, since 2×16623493881444² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 25653539617 + ... + 25653540264.

Almost surely, 2^{16623493881444} is an apocalyptic number.

It is an amenable number.

16623493881444 is an abundant number, since it is smaller than the sum of its proper divisors (26833602778610).

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

16623493881444 is a wasteful number, since it uses less digits than its factorization.

16623493881444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51307079897 (or 51307079886 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 63.

The spelling of 16623493881444 in words is "sixteen trillion, six hundred twenty-three billion, four hundred ninety-three million, eight hundred eighty-one thousand, four hundred forty-four".