166109619 has 8 divisors (see below), whose sum is σ = 238516432. Its totient is φ = 102221280.

The previous prime is 166109599. The next prime is 166109633. The reversal of 166109619 is 916901661.

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

It is not a de Polignac number, because 166109619 - 2⁹ = 166109107 is a prime.

It is a super-2 number, since 2×166109619² = 55184811048650322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 4259221 = 166109619 / (1 + 6 + 6 + 1 + 0 + 9 + 6 + 1 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166109219) 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, 2129572 + ... + 2129649.

It is an arithmetic number, because the mean of its divisors is an integer number (29814554).

Almost surely, 2^166109619 is an apocalyptic number.

166109619 is a deficient number, since it is larger than the sum of its proper divisors (72406813).

166109619 is a wasteful number, since it uses less digits than its factorization.

166109619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4259237.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 166109619 is about 12888.3520668858. The cubic root of 166109619 is about 549.7074135248.

The spelling of 166109619 in words is "one hundred sixty-six million, one hundred nine thousand, six hundred nineteen".