166659253 has 4 divisors (see below), whose sum is σ = 168277408. Its totient is φ = 165041100.

The previous prime is 166659239. The next prime is 166659277. The reversal of 166659253 is 352956661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166659253 - 2⁹ = 166658741 is a prime.

It is a super-2 number, since 2×166659253² = 55550613221036018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166659853) 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, 808923 + ... + 809128.

It is an arithmetic number, because the mean of its divisors is an integer number (42069352).

Almost surely, 2^166659253 is an apocalyptic number.

It is an amenable number.

166659253 is a deficient number, since it is larger than the sum of its proper divisors (1618155).

166659253 is a wasteful number, since it uses less digits than its factorization.

166659253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618154.

The product of its digits is 291600, while the sum is 43.

The square root of 166659253 is about 12909.6573540896. The cubic root of 166659253 is about 550.3130482321.

The spelling of 166659253 in words is "one hundred sixty-six million, six hundred fifty-nine thousand, two hundred fifty-three".