66489263 has 4 divisors (see below), whose sum is σ = 66873768. Its totient is φ = 66104760.

The previous prime is 66489233. The next prime is 66489277. The reversal of 66489263 is 36298466.

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

It is a cyclic number.

It is not a de Polignac number, because 66489263 - 2²² = 62294959 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 (66489233) 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, 191993 + ... + 192338.

It is an arithmetic number, because the mean of its divisors is an integer number (16718442).

Almost surely, 2^66489263 is an apocalyptic number.

66489263 is a deficient number, since it is larger than the sum of its proper divisors (384505).

66489263 is a wasteful number, since it uses less digits than its factorization.

66489263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384504.

The product of its digits is 373248, while the sum is 44.

The square root of 66489263 is about 8154.0948608659. The cubic root of 66489263 is about 405.1201452215.

The spelling of 66489263 in words is "sixty-six million, four hundred eighty-nine thousand, two hundred sixty-three".