1521265121265 has 16 divisors (see below), whose sum is σ = 2434047334848. Its totient is φ = 811333684416.

The previous prime is 1521265121209. The next prime is 1521265121269. The reversal of 1521265121265 is 5621215621251.

It is a happy number.

It is not a de Polignac number, because 1521265121265 - 2¹⁶ = 1521265055729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521265121269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1380334 + ... + 2224376.

It is an arithmetic number, because the mean of its divisors is an integer number (152127958428).

Almost surely, 2^{1521265121265} is an apocalyptic number.

1521265121265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1521265121265 is a deficient number, since it is larger than the sum of its proper divisors (912782213583).

1521265121265 is a wasteful number, since it uses less digits than its factorization.

1521265121265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964208.

The product of its digits is 72000, while the sum is 39.

The spelling of 1521265121265 in words is "one trillion, five hundred twenty-one billion, two hundred sixty-five million, one hundred twenty-one thousand, two hundred sixty-five".