1265242253136 has 40 divisors (see below), whose sum is σ = 3268763744064. Its totient is φ = 421718868480.

The previous prime is 1265242253131. The next prime is 1265242253207. The reversal of 1265242253136 is 6313522425621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265242253131) 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 7 ways as a sum of consecutive naturals, for example, 169660 + ... + 1599771.

Almost surely, 2^{1265242253136} is an apocalyptic number.

1265242253136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1265242253136 is an abundant number, since it is smaller than the sum of its proper divisors (2003521490928).

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

1265242253136 is a wasteful number, since it uses less digits than its factorization.

1265242253136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784339 (or 1784333 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

Adding to 1265242253136 its reverse (6313522425621), we get a palindrome (7578764678757).

The spelling of 1265242253136 in words is "one trillion, two hundred sixty-five billion, two hundred forty-two million, two hundred fifty-three thousand, one hundred thirty-six".