16861305487504 has 15 divisors (see below), whose sum is σ = 32668811205523. Its totient is φ = 8430644531248.

The previous prime is 16861305487457. The next prime is 16861305487531. The reversal of 16861305487504 is 40578450316861.

The square root of 16861305487504 is 4106252.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15911727 + ... + 16938289.

Almost surely, 2^{16861305487504} is an apocalyptic number.

16861305487504 is the 4106252-nd square number.

It is an amenable number.

16861305487504 is a deficient number, since it is larger than the sum of its proper divisors (15807505718019).

16861305487504 is an frugal number, since it uses more digits than its factorization.

16861305487504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053134 (or 1026565 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 58.

The spelling of 16861305487504 in words is "sixteen trillion, eight hundred sixty-one billion, three hundred five million, four hundred eighty-seven thousand, five hundred four".