16251405361 has 3 divisors (see below), whose sum is σ = 16251532843. Its totient is φ = 16251277880.

The previous prime is 16251405353. The next prime is 16251405367. The reversal of 16251405361 is 16350415261.

The square root of 16251405361 is 127481.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 10757630961 + 5493774400 = 103719^2 + 74120^2 .

It is not a de Polignac number, because 16251405361 - 2³ = 16251405353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16251405367) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63741 + ... + 191221.

Almost surely, 2^16251405361 is an apocalyptic number.

16251405361 is the 127481-st square number.

16251405361 is the 63741-st centered octagonal number.

It is an amenable number.

16251405361 is a deficient number, since it is larger than the sum of its proper divisors (127482).

16251405361 is an frugal number, since it uses more digits than its factorization.

16251405361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254962 (or 127481 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 16251405361 in words is "sixteen billion, two hundred fifty-one million, four hundred five thousand, three hundred sixty-one".