126505566 has 48 divisors (see below), whose sum is σ = 312024960. Its totient is φ = 36666960.

The previous prime is 126505559. The next prime is 126505571. The reversal of 126505566 is 665505621.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 126505566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9336 + ... + 18443.

It is an arithmetic number, because the mean of its divisors is an integer number (6500520).

Almost surely, 2^126505566 is an apocalyptic number.

126505566 is an abundant number, since it is smaller than the sum of its proper divisors (185519394).

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

126505566 is a wasteful number, since it uses less digits than its factorization.

126505566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27821 (or 27818 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 126505566 is about 11247.4693153616. The cubic root of 126505566 is about 501.9994153525. Note that the first 3 decimals are identical.

The spelling of 126505566 in words is "one hundred twenty-six million, five hundred five thousand, five hundred sixty-six".