1265512655 has 16 divisors (see below), whose sum is σ = 1657507968. Its totient is φ = 919908000.

The previous prime is 1265512621. The next prime is 1265512663. The reversal of 1265512655 is 5562155621.

It is not a de Polignac number, because 1265512655 - 2¹⁶ = 1265447119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134660 + ... + 143750.

It is an arithmetic number, because the mean of its divisors is an integer number (103594248).

Almost surely, 2^1265512655 is an apocalyptic number.

1265512655 is a deficient number, since it is larger than the sum of its proper divisors (391995313).

1265512655 is a wasteful number, since it uses less digits than its factorization.

1265512655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11638.

The product of its digits is 90000, while the sum is 38.

The square root of 1265512655 is about 35574.0446814809. The cubic root of 1265512655 is about 1081.6551709508.

The spelling of 1265512655 in words is "one billion, two hundred sixty-five million, five hundred twelve thousand, six hundred fifty-five".