15665005225 has 12 divisors (see below), whose sum is σ = 19427155020. Its totient is φ = 12530360000.

The previous prime is 15665005189. The next prime is 15665005229. The reversal of 15665005225 is 52250056651.

It can be written as a sum of positive squares in 6 ways, for example, as 6666395904 + 8998609321 = 81648^2 + 94861^2 .

It is not a de Polignac number, because 15665005225 - 2⁹ = 15665004713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15665005229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175671 + ... + 249379.

It is an arithmetic number, because the mean of its divisors is an integer number (1618929585).

Almost surely, 2^15665005225 is an apocalyptic number.

It is an amenable number.

15665005225 is a deficient number, since it is larger than the sum of its proper divisors (3762149795).

15665005225 is an equidigital number, since it uses as much as digits as its factorization.

15665005225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82220 (or 82215 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 15665005225 in words is "fifteen billion, six hundred sixty-five million, five thousand, two hundred twenty-five".