1265515506 has 24 divisors (see below), whose sum is σ = 2767110060. Its totient is φ = 417967776.

The previous prime is 1265515481. The next prime is 1265515541. The reversal of 1265515506 is 6055155621.

It can be written as a sum of positive squares in 2 ways, for example, as 1179304281 + 86211225 = 34341^2 + 9285^2 .

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 11 ways as a sum of consecutive naturals, for example, 320545 + ... + 324468.

Almost surely, 2^1265515506 is an apocalyptic number.

1265515506 is an abundant number, since it is smaller than the sum of its proper divisors (1501594554).

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

1265515506 is a wasteful number, since it uses less digits than its factorization.

1265515506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645130 (or 645127 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 1265515506 is about 35574.0847528085. The cubic root of 1265515506 is about 1081.6559832162.

The spelling of 1265515506 in words is "one billion, two hundred sixty-five million, five hundred fifteen thousand, five hundred six".