16251915289 has 9 divisors (see below), whose sum is σ = 17266447807. Its totient is φ = 15293880544.

The previous prime is 16251915271. The next prime is 16251915319. The reversal of 16251915289 is 98251915261.

The square root of 16251915289 is 127483.

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

It can be written as a sum of positive squares in only one way, i.e., 12652875225 + 3599040064 = 112485^2 + 59992^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16251915289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16251915209) 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, 2163462 + ... + 2170960.

Almost surely, 2^16251915289 is an apocalyptic number.

16251915289 is the 127483-rd square number.

16251915289 is the 63742-nd centered octagonal number.

It is an amenable number.

16251915289 is a deficient number, since it is larger than the sum of its proper divisors (1014532518).

16251915289 is an frugal number, since it uses more digits than its factorization.

16251915289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15032 (or 7516 counting only the distinct ones).

The product of its digits is 388800, while the sum is 49.

Multiplying 16251915289 by its sum of digits (49), we get a square (796343849161 = 892381²).

The spelling of 16251915289 in words is "sixteen billion, two hundred fifty-one million, nine hundred fifteen thousand, two hundred eighty-nine".