126665566 has 24 divisors (see below), whose sum is σ = 199831320. Its totient is φ = 60197040.

The previous prime is 126665551. The next prime is 126665579. The reversal of 126665566 is 665566621.

It is a super-2 number, since 2×126665566² = 32088331220200712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112840 + ... + 113956.

It is an arithmetic number, because the mean of its divisors is an integer number (8326305).

Almost surely, 2^126665566 is an apocalyptic number.

126665566 is a deficient number, since it is larger than the sum of its proper divisors (73165754).

126665566 is a wasteful number, since it uses less digits than its factorization.

126665566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 1209 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 126665566 is about 11254.5797789167. The cubic root of 126665566 is about 502.2109635365.

The spelling of 126665566 in words is "one hundred twenty-six million, six hundred sixty-five thousand, five hundred sixty-six".