66571091 has 8 divisors (see below), whose sum is σ = 67680000. Its totient is φ = 65467080.

The previous prime is 66571081. The next prime is 66571093. The reversal of 66571091 is 19017566.

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-66571091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66571093) 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, 34490 + ... + 36368.

It is an arithmetic number, because the mean of its divisors is an integer number (8460000).

Almost surely, 2^66571091 is an apocalyptic number.

66571091 is a deficient number, since it is larger than the sum of its proper divisors (1108909).

66571091 is a wasteful number, since it uses less digits than its factorization.

66571091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 66571091 is about 8159.1109197020. The cubic root of 66571091 is about 405.2862701957.

The spelling of 66571091 in words is "sixty-six million, five hundred seventy-one thousand, ninety-one".