66064071 has 4 divisors (see below), whose sum is σ = 88085432. Its totient is φ = 44042712.

The previous prime is 66064049. The next prime is 66064087. The reversal of 66064071 is 17046066.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66064071 - 2²² = 61869767 is a prime.

It is a super-2 number, since 2×66064071² = 8728922954186082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66064171) 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, 11010676 + ... + 11010681.

It is an arithmetic number, because the mean of its divisors is an integer number (22021358).

Almost surely, 2^66064071 is an apocalyptic number.

66064071 is a deficient number, since it is larger than the sum of its proper divisors (22021361).

66064071 is a wasteful number, since it uses less digits than its factorization.

66064071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22021360.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 66064071 is about 8127.9807455481. The cubic root of 66064071 is about 404.2547306220.

The spelling of 66064071 in words is "sixty-six million, sixty-four thousand, seventy-one".