166225019 has 4 divisors (see below), whose sum is σ = 166418496. Its totient is φ = 166031544.

The previous prime is 166224967. The next prime is 166225027. The reversal of 166225019 is 910522661.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166225019 is a prime.

It is a super-2 number, since 2×166225019² = 55261513883100722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166225039) 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, 95444 + ... + 97169.

It is an arithmetic number, because the mean of its divisors is an integer number (41604624).

Almost surely, 2^166225019 is an apocalyptic number.

166225019 is a deficient number, since it is larger than the sum of its proper divisors (193477).

166225019 is an equidigital number, since it uses as much as digits as its factorization.

166225019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193476.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 166225019 is about 12892.8282002049. The cubic root of 166225019 is about 549.8346819944.

The spelling of 166225019 in words is "one hundred sixty-six million, two hundred twenty-five thousand, nineteen".