1265264243380 has 12 divisors (see below), whose sum is σ = 2657054911140. Its totient is φ = 506105697344.

The previous prime is 1265264243371. The next prime is 1265264243381. The reversal of 1265264243380 is 833424625621.

It can be written as a sum of positive squares in 2 ways, for example, as 748976008356 + 516288235024 = 865434^2 + 718532^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1265264243380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265264243381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31631606065 + ... + 31631606104.

It is an arithmetic number, because the mean of its divisors is an integer number (221421242595).

Almost surely, 2^{1265264243380} is an apocalyptic number.

1265264243380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265264243380 is an abundant number, since it is smaller than the sum of its proper divisors (1391790667760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265264243380 is a wasteful number, since it uses less digits than its factorization.

1265264243380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63263212178 (or 63263212176 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 46.

The spelling of 1265264243380 in words is "one trillion, two hundred sixty-five billion, two hundred sixty-four million, two hundred forty-three thousand, three hundred eighty".