66027891 has 8 divisors (see below), whose sum is σ = 88165584. Its totient is φ = 43954400.

The previous prime is 66027883. The next prime is 66027901. The reversal of 66027891 is 19872066.

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

It is a cyclic number.

It is not a de Polignac number, because 66027891 - 2³ = 66027883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66027851) 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, 13596 + ... + 17801.

It is an arithmetic number, because the mean of its divisors is an integer number (11020698).

Almost surely, 2^66027891 is an apocalyptic number.

66027891 is a deficient number, since it is larger than the sum of its proper divisors (22137693).

66027891 is a wasteful number, since it uses less digits than its factorization.

66027891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32101.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 66027891 is about 8125.7547957097. The cubic root of 66027891 is about 404.1809204217.

The spelling of 66027891 in words is "sixty-six million, twenty-seven thousand, eight hundred ninety-one".