16787089225 has 9 divisors (see below), whose sum is σ = 20816793973. Its totient is φ = 13429153120.

The previous prime is 16787089223. The next prime is 16787089243. The reversal of 16787089225 is 52298078761.

The square root of 16787089225 is 129565.

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 12694969 + 16774394256 = 3563^2 + 129516^2 .

It is not a de Polignac number, because 16787089225 - 2¹ = 16787089223 is a prime.

It is a super-2 number, since 2×16787089225² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16787089223) 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, 634869 + ... + 660781.

Almost surely, 2^16787089225 is an apocalyptic number.

16787089225 is the 129565-th square number.

16787089225 is the 64783-rd centered octagonal number.

It is an amenable number.

16787089225 is a deficient number, since it is larger than the sum of its proper divisors (4029704748).

16787089225 is an frugal number, since it uses more digits than its factorization.

16787089225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51836 (or 25918 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 16787089225 in words is "sixteen billion, seven hundred eighty-seven million, eighty-nine thousand, two hundred twenty-five".