166672239 has 4 divisors (see below), whose sum is σ = 222229656. Its totient is φ = 111114824.

The previous prime is 166672229. The next prime is 166672241. The reversal of 166672239 is 932276661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932276661 = 3 ⋅310758887.

It is a cyclic number.

It is not a de Polignac number, because 166672239 - 2⁴ = 166672223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166672239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166672229) 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, 27778704 + ... + 27778709.

It is an arithmetic number, because the mean of its divisors is an integer number (55557414).

Almost surely, 2^166672239 is an apocalyptic number.

166672239 is a deficient number, since it is larger than the sum of its proper divisors (55557417).

166672239 is an equidigital number, since it uses as much as digits as its factorization.

166672239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55557416.

The product of its digits is 163296, while the sum is 42.

The square root of 166672239 is about 12910.1603010962. The cubic root of 166672239 is about 550.3273412272.

The spelling of 166672239 in words is "one hundred sixty-six million, six hundred seventy-two thousand, two hundred thirty-nine".