109661661 has 8 divisors (see below), whose sum is σ = 162461760. Its totient is φ = 73107756.

The previous prime is 109661609. The next prime is 109661681. The reversal of 109661661 is 166166901.

It is not a de Polignac number, because 109661661 - 2⁷ = 109661533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109661681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2030745 + ... + 2030798.

It is an arithmetic number, because the mean of its divisors is an integer number (20307720).

Almost surely, 2^109661661 is an apocalyptic number.

It is an amenable number.

109661661 is a deficient number, since it is larger than the sum of its proper divisors (52800099).

109661661 is an equidigital number, since it uses as much as digits as its factorization.

109661661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061552 (or 4061546 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 109661661 is about 10471.9463806878. The cubic root of 109661661 is about 478.6502314219.

The spelling of 109661661 in words is "one hundred nine million, six hundred sixty-one thousand, six hundred sixty-one".