1265451505512 has 16 divisors (see below), whose sum is σ = 3163628763840. Its totient is φ = 421817168496.

The previous prime is 1265451505481. The next prime is 1265451505537. The reversal of 1265451505512 is 2155051545621.

It is a happy number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26363573008 + ... + 26363573055.

It is an arithmetic number, because the mean of its divisors is an integer number (197726797740).

Almost surely, 2^{1265451505512} is an apocalyptic number.

1265451505512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1265451505512 is an abundant number, since it is smaller than the sum of its proper divisors (1898177258328).

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

1265451505512 is a wasteful number, since it uses less digits than its factorization.

1265451505512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52727146072 (or 52727146068 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 42.

The spelling of 1265451505512 in words is "one trillion, two hundred sixty-five billion, four hundred fifty-one million, five hundred five thousand, five hundred twelve".