166623549 has 8 divisors (see below), whose sum is σ = 227583552. Its totient is φ = 108372960.

The previous prime is 166623547. The next prime is 166623553. The reversal of 166623549 is 945326661.

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

It is not a de Polignac number, because 166623549 - 2¹ = 166623547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166623549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166623547) 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, 677209 + ... + 677454.

It is an arithmetic number, because the mean of its divisors is an integer number (28447944).

Almost surely, 2^166623549 is an apocalyptic number.

It is an amenable number.

166623549 is a deficient number, since it is larger than the sum of its proper divisors (60960003).

166623549 is a wasteful number, since it uses less digits than its factorization.

166623549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354707.

The product of its digits is 233280, while the sum is 42.

The square root of 166623549 is about 12908.2744392889. The cubic root of 166623549 is about 550.2737469232.

The spelling of 166623549 in words is "one hundred sixty-six million, six hundred twenty-three thousand, five hundred forty-nine".