126661566 has 8 divisors (see below), whose sum is σ = 253323144. Its totient is φ = 42220520.

The previous prime is 126661541. The next prime is 126661603. The reversal of 126661566 is 665166621.

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

126661566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10555125 + ... + 10555136.

It is an arithmetic number, because the mean of its divisors is an integer number (31665393).

Almost surely, 2^126661566 is an apocalyptic number.

126661566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

126661566 is a wasteful number, since it uses less digits than its factorization.

126661566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21110266.

The product of its digits is 77760, while the sum is 39.

The square root of 126661566 is about 11254.4020720783. The cubic root of 126661566 is about 502.2056770037.

The spelling of 126661566 in words is "one hundred twenty-six million, six hundred sixty-one thousand, five hundred sixty-six".