16397704225 has 18 divisors (see below), whose sum is σ = 23652853494. Its totient is φ = 11244139200.

The previous prime is 16397704201. The next prime is 16397704307. The reversal of 16397704225 is 52240779361.

It can be written as a sum of positive squares in 3 ways, for example, as 4582883809 + 11814820416 = 67697^2 + 108696^2 .

It is not a de Polignac number, because 16397704225 - 2¹³ = 16397696033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6691716 + ... + 6694165.

Almost surely, 2^16397704225 is an apocalyptic number.

It is an amenable number.

16397704225 is a deficient number, since it is larger than the sum of its proper divisors (7255149269).

16397704225 is a wasteful number, since it uses less digits than its factorization.

16397704225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13385905 (or 13385893 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 16397704225 in words is "sixteen billion, three hundred ninety-seven million, seven hundred four thousand, two hundred twenty-five".