109666478 has 4 divisors (see below), whose sum is σ = 164499720. Its totient is φ = 54833238.

The previous prime is 109666477. The next prime is 109666481. The reversal of 109666478 is 874666901.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-4 number, since 4×109666478⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109666477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27416618 + ... + 27416621.

It is an arithmetic number, because the mean of its divisors is an integer number (41124930).

Almost surely, 2^109666478 is an apocalyptic number.

109666478 is a deficient number, since it is larger than the sum of its proper divisors (54833242).

109666478 is an equidigital number, since it uses as much as digits as its factorization.

109666478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54833241.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 109666478 is about 10472.1763736102. The cubic root of 109666478 is about 478.6572397187.

The spelling of 109666478 in words is "one hundred nine million, six hundred sixty-six thousand, four hundred seventy-eight".