16183656225 has 135 divisors (see below), whose sum is σ = 33079435081. Its totient is φ = 7816089600.

The previous prime is 16183656199. The next prime is 16183656227. The reversal of 16183656225 is 52265638161.

The square root of 16183656225 is 127215.

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

16183656225 is a `hidden beast` number, since 1 + 6 + 1 + 83 + 6 + 562 + 2 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3976941969 + 12206714256 = 63063^2 + 110484^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 16183656225 - 2⁵ = 16183656193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (16183656227) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 62971297 + ... + 62971553.

Almost surely, 2^16183656225 is an apocalyptic number.

16183656225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16183656225 is the 127215-th square number.

16183656225 is the 63608-th centered octagonal number.

It is an amenable number.

16183656225 is an abundant number, since it is smaller than the sum of its proper divisors (16895778856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16183656225 is an equidigital number, since it uses as much as digits as its factorization.

16183656225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 276 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 16183656225 in words is "sixteen billion, one hundred eighty-three million, six hundred fifty-six thousand, two hundred twenty-five".