66115263 has 16 divisors (see below), whose sum is σ = 90976256. Its totient is φ = 42677280.

The previous prime is 66115249. The next prime is 66115279. The reversal of 66115263 is 36251166.

It is not a de Polignac number, because 66115263 - 2¹⁰ = 66114239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66115263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66115663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23418 + ... + 26088.

It is an arithmetic number, because the mean of its divisors is an integer number (5686016).

Almost surely, 2^66115263 is an apocalyptic number.

66115263 is a deficient number, since it is larger than the sum of its proper divisors (24860993).

66115263 is a wasteful number, since it uses less digits than its factorization.

66115263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934.

The product of its digits is 6480, while the sum is 30.

The square root of 66115263 is about 8131.1292573664. The cubic root of 66115263 is about 404.3591205213.

The spelling of 66115263 in words is "sixty-six million, one hundred fifteen thousand, two hundred sixty-three".