1265451505511 has 16 divisors (see below), whose sum is σ = 1292875499520. Its totient is φ = 1238297511360.

The previous prime is 1265451505481. The next prime is 1265451505537. The reversal of 1265451505511 is 1155051545621.

It is a cyclic number.

It is not a de Polignac number, because 1265451505511 - 2²² = 1265447311207 is a prime.

It is a super-2 number, since 2×1265451505511² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265451501511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86436530 + ... + 86451168.

It is an arithmetic number, because the mean of its divisors is an integer number (80804718720).

Almost surely, 2^{1265451505511} is an apocalyptic number.

1265451505511 is a deficient number, since it is larger than the sum of its proper divisors (27423994009).

1265451505511 is a wasteful number, since it uses less digits than its factorization.

1265451505511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23734.

The product of its (nonzero) digits is 150000, while the sum is 41.

The spelling of 1265451505511 in words is "one trillion, two hundred sixty-five billion, four hundred fifty-one million, five hundred five thousand, five hundred eleven".