16164123725 has 6 divisors (see below), whose sum is σ = 20043513450. Its totient is φ = 12931298960.

The previous prime is 16164123721. The next prime is 16164123749. The reversal of 16164123725 is 52732146161.

It can be written as a sum of positive squares in 3 ways, for example, as 609793636 + 15554330089 = 24694^2 + 124717^2 .

It is not a de Polignac number, because 16164123725 - 2² = 16164123721 is a prime.

It is a super-2 number, since 2×16164123725² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16164123721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323282450 + ... + 323282499.

It is an arithmetic number, because the mean of its divisors is an integer number (3340585575).

Almost surely, 2^16164123725 is an apocalyptic number.

It is an amenable number.

16164123725 is a deficient number, since it is larger than the sum of its proper divisors (3879389725).

16164123725 is an equidigital number, since it uses as much as digits as its factorization.

16164123725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646564959 (or 646564954 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

Adding to 16164123725 its reverse (52732146161), we get a palindrome (68896269886).

The spelling of 16164123725 in words is "sixteen billion, one hundred sixty-four million, one hundred twenty-three thousand, seven hundred twenty-five".