16641516004 has 27 divisors (see below), whose sum is σ = 29706914587. Its totient is φ = 8157054464.

The previous prime is 16641515999. The next prime is 16641516013. The reversal of 16641516004 is 40061514661.

The square root of 16641516004 is 129002.

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

It can be written as a sum of positive squares in 4 ways, for example, as 62378404 + 16579137600 = 7898^2 + 128760^2 .

It is a super-2 number, since 2×16641516004² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13673604 + ... + 13674820.

Almost surely, 2^16641516004 is an apocalyptic number.

16641516004 is the 129002-nd square number.

It is an amenable number.

16641516004 is a deficient number, since it is larger than the sum of its proper divisors (13065398583).

16641516004 is an frugal number, since it uses more digits than its factorization.

16641516004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 16641516004 in words is "sixteen billion, six hundred forty-one million, five hundred sixteen thousand, four".