1265511511479 has 4 divisors (see below), whose sum is σ = 1687348681976. Its totient is φ = 843674340984.

The previous prime is 1265511511351. The next prime is 1265511511483. The reversal of 1265511511479 is 9741151155621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1265511511479 - 2⁷ = 1265511511351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265511511279) 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 3 ways as a sum of consecutive naturals, for example, 210918585244 + ... + 210918585249.

It is an arithmetic number, because the mean of its divisors is an integer number (421837170494).

Almost surely, 2^{1265511511479} is an apocalyptic number.

1265511511479 is a deficient number, since it is larger than the sum of its proper divisors (421837170497).

1265511511479 is an equidigital number, since it uses as much as digits as its factorization.

1265511511479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421837170496.

The product of its digits is 378000, while the sum is 48.

The spelling of 1265511511479 in words is "one trillion, two hundred sixty-five billion, five hundred eleven million, five hundred eleven thousand, four hundred seventy-nine".