666233501 has 4 divisors (see below), whose sum is σ = 689207100. Its totient is φ = 643259904.

The previous prime is 666233497. The next prime is 666233527. The reversal of 666233501 is 105332666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105332666 = 2 ⋅52666333.

It can be written as a sum of positive squares in 2 ways, for example, as 418202500 + 248031001 = 20450^2 + 15749^2 .

It is not a de Polignac number, because 666233501 - 2² = 666233497 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 (666233591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11486756 + ... + 11486813.

It is an arithmetic number, because the mean of its divisors is an integer number (172301775).

Almost surely, 2^666233501 is an apocalyptic number.

It is an amenable number.

666233501 is a deficient number, since it is larger than the sum of its proper divisors (22973599).

666233501 is a wasteful number, since it uses less digits than its factorization.

666233501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22973598.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 666233501 is about 25811.4993946497. The cubic root of 666233501 is about 873.3912212113.

The spelling of 666233501 in words is "six hundred sixty-six million, two hundred thirty-three thousand, five hundred one".