1645262513225 has 12 divisors (see below), whose sum is σ = 2055016947804. Its totient is φ = 1306602635520.

The previous prime is 1645262513201. The next prime is 1645262513239. The reversal of 1645262513225 is 5223152625461.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 19525311289 + 1625737201936 = 139733^2 + 1275044^2 .

It is not a de Polignac number, because 1645262513225 - 2²⁶ = 1645195404361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 240180884 + ... + 240187733.

It is an arithmetic number, because the mean of its divisors is an integer number (171251412317).

Almost surely, 2^{1645262513225} is an apocalyptic number.

It is an amenable number.

1645262513225 is a deficient number, since it is larger than the sum of its proper divisors (409754434579).

1645262513225 is a wasteful number, since it uses less digits than its factorization.

1645262513225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480368764 (or 480368759 counting only the distinct ones).

The product of its digits is 864000, while the sum is 44.

The spelling of 1645262513225 in words is "one trillion, six hundred forty-five billion, two hundred sixty-two million, five hundred thirteen thousand, two hundred twenty-five".