16001744004 has 81 divisors (see below), whose sum is σ = 41949439077. Its totient is φ = 5142902688.

The previous prime is 16001743997. The next prime is 16001744089. The reversal of 16001744004 is 40044710061.

The square root of 16001744004 is 126498.

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

16001744004 is a `hidden beast` number, since 1 + 600 + 17 + 4 + 40 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8390926404 + 7610817600 = 91602^2 + 87240^2 .

It is a super-2 number, since 2×16001744004² (a number of 21 digits) contains 22 as substring.

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, 22010289 + ... + 22011015.

Almost surely, 2^16001744004 is an apocalyptic number.

16001744004 is the 126498-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16001744004

16001744004 is an abundant number, since it is smaller than the sum of its proper divisors (25947695073).

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

16001744004 is an equidigital number, since it uses as much as digits as its factorization.

16001744004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The spelling of 16001744004 in words is "sixteen billion, one million, seven hundred forty-four thousand, four".