16138653444 has 81 divisors (see below), whose sum is σ = 42215153799. Its totient is φ = 5198394960.

The previous prime is 16138653407. The next prime is 16138653463. The reversal of 16138653444 is 44435683161.

The square root of 16138653444 is 127038.

It is a perfect power (a square), and thus also a powerful number.

16138653444 is a `hidden beast` number, since 16 + 138 + 65 + 3 + 444 = 666.

It is a super-2 number, since 2×16138653444² (a number of 21 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 16138653444.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 23628727 + ... + 23629409.

Almost surely, 2^16138653444 is an apocalyptic number.

16138653444 is the 127038-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16138653444

16138653444 is an abundant number, since it is smaller than the sum of its proper divisors (26076500355).

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

16138653444 is an equidigital number, since it uses as much as digits as its factorization.

16138653444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 719 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 16138653444 in words is "sixteen billion, one hundred thirty-eight million, six hundred fifty-three thousand, four hundred forty-four".