1565445425 has 12 divisors (see below), whose sum is σ = 2055338316. Its totient is φ = 1178688000.

The previous prime is 1565445421. The next prime is 1565445439. The reversal of 1565445425 is 5245445651.

It can be written as a sum of positive squares in 6 ways, for example, as 53479969 + 1511965456 = 7313^2 + 38884^2 .

It is not a de Polignac number, because 1565445425 - 2² = 1565445421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1565445421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1841276 + ... + 1842125.

It is an arithmetic number, because the mean of its divisors is an integer number (171278193).

Almost surely, 2^1565445425 is an apocalyptic number.

It is an amenable number.

1565445425 is a deficient number, since it is larger than the sum of its proper divisors (489892891).

1565445425 is a wasteful number, since it uses less digits than its factorization.

1565445425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683428 (or 3683423 counting only the distinct ones).

The product of its digits is 480000, while the sum is 41.

The square root of 1565445425 is about 39565.7102173081. The cubic root of 1565445425 is about 1161.1258948148.

The spelling of 1565445425 in words is "one billion, five hundred sixty-five million, four hundred forty-five thousand, four hundred twenty-five".