1265881101120 has 84 divisors (see below), whose sum is σ = 4354103547300. Its totient is φ = 337568292864.

The previous prime is 1265881101083. The next prime is 1265881101127. The reversal of 1265881101120 is 211011885621.

It can be written as a sum of positive squares in 2 ways, for example, as 259904196864 + 1005976904256 = 509808^2 + 1002984^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265881101127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219768145 + ... + 219773904.

Almost surely, 2^{1265881101120} is an apocalyptic number.

1265881101120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265881101120 is an abundant number, since it is smaller than the sum of its proper divisors (3088222446180).

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

1265881101120 is a wasteful number, since it uses less digits than its factorization.

1265881101120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439542072 (or 439542059 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 36.

Adding to 1265881101120 its reverse (211011885621), we get a palindrome (1476892986741).

The spelling of 1265881101120 in words is "one trillion, two hundred sixty-five billion, eight hundred eighty-one million, one hundred one thousand, one hundred twenty".