101666566 has 8 divisors (see below), whose sum is σ = 152733240. Its totient is φ = 50755488.

The previous prime is 101666563. The next prime is 101666603. The reversal of 101666566 is 665666101.

101666566 is nontrivially palindromic in base 16.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101666563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37251 + ... + 39886.

It is an arithmetic number, because the mean of its divisors is an integer number (19091655).

Almost surely, 2^101666566 is an apocalyptic number.

101666566 is a deficient number, since it is larger than the sum of its proper divisors (51066674).

101666566 is an equidigital number, since it uses as much as digits as its factorization.

101666566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77798.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 101666566 is about 10082.9839829289. The cubic root of 101666566 is about 466.7231950797.

The spelling of 101666566 in words is "one hundred one million, six hundred sixty-six thousand, five hundred sixty-six".