126555566 has 8 divisors (see below), whose sum is σ = 189996840. Its totient is φ = 63223288.

The previous prime is 126555553. The next prime is 126555571. The reversal of 126555566 is 665555621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×126555566² = 32032622571160712, 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 3 ways as a sum of consecutive naturals, for example, 24281 + ... + 29028.

It is an arithmetic number, because the mean of its divisors is an integer number (23749605).

Almost surely, 2^126555566 is an apocalyptic number.

126555566 is a deficient number, since it is larger than the sum of its proper divisors (63441274).

126555566 is a wasteful number, since it uses less digits than its factorization.

126555566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54498.

The product of its digits is 270000, while the sum is 41.

The square root of 126555566 is about 11249.6918180011. The cubic root of 126555566 is about 502.0655433116.

It can be divided in two parts, 1265555 and 66, that added together give a palindrome (1265621).

The spelling of 126555566 in words is "one hundred twenty-six million, five hundred fifty-five thousand, five hundred sixty-six".