106561666 has 8 divisors (see below), whose sum is σ = 161425404. Its totient is φ = 52753200.

The previous prime is 106561657. The next prime is 106561667. The reversal of 106561666 is 666165601.

It can be written as a sum of positive squares in 2 ways, for example, as 100902025 + 5659641 = 10045^2 + 2379^2 .

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

It is a super-2 number, since 2×106561666² = 22710777321391112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (106561667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263565 + ... + 263968.

Almost surely, 2^106561666 is an apocalyptic number.

106561666 is a deficient number, since it is larger than the sum of its proper divisors (54863738).

106561666 is a wasteful number, since it uses less digits than its factorization.

106561666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527636.

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

The square root of 106561666 is about 10322.8710153716. The cubic root of 106561666 is about 474.0967744391.

The spelling of 106561666 in words is "one hundred six million, five hundred sixty-one thousand, six hundred sixty-six".