16601507225 has 6 divisors (see below), whose sum is σ = 20585868990. Its totient is φ = 13281205760.

The previous prime is 16601507207. The next prime is 16601507227. The reversal of 16601507225 is 52270510661.

It can be written as a sum of positive squares in 3 ways, for example, as 539493529 + 16062013696 = 23227^2 + 126736^2 .

It is not a de Polignac number, because 16601507225 - 2²⁰ = 16600458649 is a prime.

It is a super-2 number, since 2×16601507225² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16601507227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 332030120 + ... + 332030169.

It is an arithmetic number, because the mean of its divisors is an integer number (3430978165).

Almost surely, 2^16601507225 is an apocalyptic number.

It is an amenable number.

16601507225 is a deficient number, since it is larger than the sum of its proper divisors (3984361765).

16601507225 is an equidigital number, since it uses as much as digits as its factorization.

16601507225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664060299 (or 664060294 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 16601507225 in words is "sixteen billion, six hundred one million, five hundred seven thousand, two hundred twenty-five".