1605250025 has 6 divisors (see below), whose sum is σ = 1990510062. Its totient is φ = 1284200000.

The previous prime is 1605250019. The next prime is 1605250033. The reversal of 1605250025 is 5200525061.

It can be written as a sum of positive squares in 3 ways, for example, as 257185369 + 1348064656 = 16037^2 + 36716^2 .

It is not a de Polignac number, because 1605250025 - 2²⁶ = 1538141161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1605249976 and 1605250003.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32104976 + ... + 32105025.

It is an arithmetic number, because the mean of its divisors is an integer number (331751677).

Almost surely, 2^1605250025 is an apocalyptic number.

It is an amenable number.

1605250025 is a deficient number, since it is larger than the sum of its proper divisors (385260037).

1605250025 is an equidigital number, since it uses as much as digits as its factorization.

1605250025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64210011 (or 64210006 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1605250025 is about 40065.5715671198. The cubic root of 1605250025 is about 1170.8849624809.

Adding to 1605250025 its reverse (5200525061), we get a palindrome (6805775086).

The spelling of 1605250025 in words is "one billion, six hundred five million, two hundred fifty thousand, twenty-five".