16257741703921 has 9 divisors (see below), whose sum is σ = 16368191224833. Its totient is φ = 16148032594320.

The previous prime is 16257741703891. The next prime is 16257741703927. The reversal of 16257741703921 is 12930714775261.

The square root of 16257741703921 is 4032089.

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 9451695558321 + 6806046145600 = 3074361^2 + 2608840^2 .

It is not a de Polignac number, because 16257741703921 - 2²⁵ = 16257708149489 is a prime.

It is a super-2 number, since 2×16257741703921² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16257741703927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 600767731 + ... + 600794791.

Almost surely, 2^{16257741703921} is an apocalyptic number.

16257741703921 is the 4032089-th square number.

16257741703921 is the 2016045-th centered octagonal number.

It is an amenable number.

16257741703921 is a deficient number, since it is larger than the sum of its proper divisors (110449520912).

16257741703921 is an frugal number, since it uses more digits than its factorization.

16257741703921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54420 (or 27210 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 16257741703921 in words is "sixteen trillion, two hundred fifty-seven billion, seven hundred forty-one million, seven hundred three thousand, nine hundred twenty-one".