66406263 has 32 divisors (see below), whose sum is σ = 111501312. Its totient is φ = 34149600.

The previous prime is 66406261. The next prime is 66406271. The reversal of 66406263 is 36260466.

It is not a de Polignac number, because 66406263 - 2¹ = 66406261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66406261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22398 + ... + 25188.

It is an arithmetic number, because the mean of its divisors is an integer number (3484416).

Almost surely, 2^66406263 is an apocalyptic number.

66406263 is a deficient number, since it is larger than the sum of its proper divisors (45095049).

66406263 is a wasteful number, since it uses less digits than its factorization.

66406263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 66406263 is about 8149.0038041469. The cubic root of 66406263 is about 404.9515015848.

The spelling of 66406263 in words is "sixty-six million, four hundred six thousand, two hundred sixty-three".