16464739225 has 27 divisors (see below), whose sum is σ = 22450654429. Its totient is φ = 11969223200.

The previous prime is 16464739223. The next prime is 16464739271. The reversal of 16464739225 is 52293746461.

The square root of 16464739225 is 128315.

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 1459469209 + 15005270016 = 38203^2 + 122496^2 .

It is not a de Polignac number, because 16464739225 - 2¹ = 16464739223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16464739223) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7056159 + ... + 7058491.

Almost surely, 2^16464739225 is an apocalyptic number.

16464739225 is the 128315-th square number.

16464739225 is the 64158-th centered octagonal number.

It is an amenable number.

16464739225 is a deficient number, since it is larger than the sum of its proper divisors (5985915204).

16464739225 is an frugal number, since it uses more digits than its factorization.

16464739225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698 (or 2349 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 49.

Multiplying 16464739225 by its sum of digits (49), we get a square (806772222025 = 898205²).

The spelling of 16464739225 in words is "sixteen billion, four hundred sixty-four million, seven hundred thirty-nine thousand, two hundred twenty-five".