1265012645 has 16 divisors (see below), whose sum is σ = 1638896112. Its totient is φ = 931814400.

The previous prime is 1265012621. The next prime is 1265012659. The reversal of 1265012645 is 5462105621.

It can be written as a sum of positive squares in 8 ways, for example, as 107516161 + 1157496484 = 10369^2 + 34022^2 .

It is not a de Polignac number, because 1265012645 - 2⁸ = 1265012389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1799 + ... + 50331.

It is an arithmetic number, because the mean of its divisors is an integer number (102431007).

Almost surely, 2^1265012645 is an apocalyptic number.

It is an amenable number.

1265012645 is a deficient number, since it is larger than the sum of its proper divisors (373883467).

1265012645 is a wasteful number, since it uses less digits than its factorization.

1265012645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48952.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1265012645 is about 35567.0162510155. The cubic root of 1265012645 is about 1081.5126965038.

The spelling of 1265012645 in words is "one billion, two hundred sixty-five million, twelve thousand, six hundred forty-five".