265664656 has 20 divisors (see below), whose sum is σ = 515371900. Its totient is φ = 132665472.

The previous prime is 265664617. The next prime is 265664671. The reversal of 265664656 is 656466562.

It can be written as a sum of positive squares in 2 ways, for example, as 109914256 + 155750400 = 10484^2 + 12480^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3250 + ... + 23278.

It is an arithmetic number, because the mean of its divisors is an integer number (25768595).

Almost surely, 2^265664656 is an apocalyptic number.

It is an amenable number.

265664656 is a deficient number, since it is larger than the sum of its proper divisors (249707244).

265664656 is a wasteful number, since it uses less digits than its factorization.

265664656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20866 (or 20860 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 46.

The square root of 265664656 is about 16299.2225581468. Note that the first 3 decimals coincide. The cubic root of 265664656 is about 642.8523856391.

The spelling of 265664656 in words is "two hundred sixty-five million, six hundred sixty-four thousand, six hundred fifty-six".