1265264243378 has 16 divisors (see below), whose sum is σ = 2056270756320. Its totient is φ = 581571525696.

The previous prime is 1265264243371. The next prime is 1265264243381. The reversal of 1265264243378 is 8733424625621.

It is not an unprimeable number, because it can be changed into a prime (1265264243371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432715448 + ... + 432718371.

It is an arithmetic number, because the mean of its divisors is an integer number (128516922270).

Almost surely, 2^{1265264243378} is an apocalyptic number.

1265264243378 is a deficient number, since it is larger than the sum of its proper divisors (791006512942).

1265264243378 is a wasteful number, since it uses less digits than its factorization.

1265264243378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865433881.

The product of its digits is 11612160, while the sum is 53.

Adding to 1265264243378 its reverse (8733424625621), we get a palindrome (9998688868999).

The spelling of 1265264243378 in words is "one trillion, two hundred sixty-five billion, two hundred sixty-four million, two hundred forty-three thousand, three hundred seventy-eight".