1265564026 has 16 divisors (see below), whose sum is σ = 1960450560. Its totient is φ = 612098640.

The previous prime is 1265563993. The next prime is 1265564039. The reversal of 1265564026 is 6204655621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277795 + ... + 282313.

It is an arithmetic number, because the mean of its divisors is an integer number (122528160).

Almost surely, 2^1265564026 is an apocalyptic number.

1265564026 is a deficient number, since it is larger than the sum of its proper divisors (694886534).

1265564026 is a wasteful number, since it uses less digits than its factorization.

1265564026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 1265564026 is about 35574.7667033812. The cubic root of 1265564026 is about 1081.6698066417.

The spelling of 1265564026 in words is "one billion, two hundred sixty-five million, five hundred sixty-four thousand, twenty-six".