66131263 has 4 divisors (see below), whose sum is σ = 72143208. Its totient is φ = 60119320.

The previous prime is 66131251. The next prime is 66131287. The reversal of 66131263 is 36213166.

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 66131263 - 2⁵ = 66131231 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 (66131203) 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, 3005956 + ... + 3005977.

It is an arithmetic number, because the mean of its divisors is an integer number (18035802).

Almost surely, 2^66131263 is an apocalyptic number.

66131263 is a deficient number, since it is larger than the sum of its proper divisors (6011945).

66131263 is a wasteful number, since it uses less digits than its factorization.

66131263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011944.

The product of its digits is 3888, while the sum is 28.

The square root of 66131263 is about 8132.1130710290. The cubic root of 66131263 is about 404.3917364096.

The spelling of 66131263 in words is "sixty-six million, one hundred thirty-one thousand, two hundred sixty-three".