1265254956180 has 144 divisors (see below), whose sum is σ = 3961563173568. Its totient is φ = 326659008000.

The previous prime is 1265254956167. The next prime is 1265254956181. The reversal of 1265254956180 is 816594525621.

1265254956180 is a `hidden beast` number, since 1 + 26 + 5 + 2 + 54 + 9 + 561 + 8 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265254956181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 312415 + ... + 1621145.

It is an arithmetic number, because the mean of its divisors is an integer number (27510855372).

Almost surely, 2^{1265254956180} is an apocalyptic number.

1265254956180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265254956180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1980781586784).

1265254956180 is an abundant number, since it is smaller than the sum of its proper divisors (2696308217388).

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

1265254956180 is a wasteful number, since it uses less digits than its factorization.

1265254956180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308918 (or 1308913 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 54.

The spelling of 1265254956180 in words is "one trillion, two hundred sixty-five billion, two hundred fifty-four million, nine hundred fifty-six thousand, one hundred eighty".