166319453 has 4 divisors (see below), whose sum is σ = 166535388. Its totient is φ = 166103520.

The previous prime is 166319443. The next prime is 166319479. The reversal of 166319453 is 354913661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73736569 + 92582884 = 8587^2 + 9622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166319453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166319443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106808 + ... + 108353.

It is an arithmetic number, because the mean of its divisors is an integer number (41633847).

Almost surely, 2^166319453 is an apocalyptic number.

It is an amenable number.

166319453 is a deficient number, since it is larger than the sum of its proper divisors (215935).

166319453 is an equidigital number, since it uses as much as digits as its factorization.

166319453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215934.

The product of its digits is 58320, while the sum is 38.

The square root of 166319453 is about 12896.4899488194. The cubic root of 166319453 is about 549.9387843715.

The spelling of 166319453 in words is "one hundred sixty-six million, three hundred nineteen thousand, four hundred fifty-three".