100566661 has 6 divisors (see below), whose sum is σ = 108897810. Its totient is φ = 92830608.

The previous prime is 100566647. The next prime is 100566671. The reversal of 100566661 is 166665001.

It can be written as a sum of positive squares in 3 ways, for example, as 4330561 + 96236100 = 2081^2 + 9810^2 .

It is not a de Polignac number, because 100566661 - 2¹⁷ = 100435589 is a prime.

It is a super-2 number, since 2×100566661² = 20227306609377842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100566671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 297366 + ... + 297703.

It is an arithmetic number, because the mean of its divisors is an integer number (18149635).

Almost surely, 2^100566661 is an apocalyptic number.

It is an amenable number.

100566661 is a deficient number, since it is larger than the sum of its proper divisors (8331149).

100566661 is an equidigital number, since it uses as much as digits as its factorization.

100566661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595095 (or 595082 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 100566661 is about 10028.2930252361. The cubic root of 100566661 is about 465.0339683052.

The spelling of 100566661 in words is "one hundred million, five hundred sixty-six thousand, six hundred sixty-one".