66227891 has 8 divisors (see below), whose sum is σ = 68192064. Its totient is φ = 64272960.

The previous prime is 66227881. The next prime is 66227897. The reversal of 66227891 is 19872266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66227891 is a prime.

It is a super-2 number, since 2×66227891² = 8772267092615762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66227897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13871 + ... + 18023.

It is an arithmetic number, because the mean of its divisors is an integer number (8524008).

Almost surely, 2^66227891 is an apocalyptic number.

66227891 is a deficient number, since it is larger than the sum of its proper divisors (1964173).

66227891 is a wasteful number, since it uses less digits than its factorization.

66227891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4621.

The product of its digits is 72576, while the sum is 41.

The square root of 66227891 is about 8138.0520396468. The cubic root of 66227891 is about 404.5886001750.

The spelling of 66227891 in words is "sixty-six million, two hundred twenty-seven thousand, eight hundred ninety-one".