66264961 has 4 divisors (see below), whose sum is σ = 75731392. Its totient is φ = 56798532.

The previous prime is 66264937. The next prime is 66265007. The reversal of 66264961 is 16946266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66264961 - 2¹¹ = 66262913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66264911) 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, 4733205 + ... + 4733218.

It is an arithmetic number, because the mean of its divisors is an integer number (18932848).

Almost surely, 2^66264961 is an apocalyptic number.

It is an amenable number.

66264961 is a deficient number, since it is larger than the sum of its proper divisors (9466431).

66264961 is an equidigital number, since it uses as much as digits as its factorization.

66264961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466430.

The product of its digits is 93312, while the sum is 40.

The square root of 66264961 is about 8140.3292930937. The cubic root of 66264961 is about 404.6640734222.

The spelling of 66264961 in words is "sixty-six million, two hundred sixty-four thousand, nine hundred sixty-one".