66571412 has 12 divisors (see below), whose sum is σ = 117282900. Its totient is φ = 33062016.

The previous prime is 66571387. The next prime is 66571433. The reversal of 66571412 is 21417566.

It can be written as a sum of positive squares in 2 ways, for example, as 9024016 + 57547396 = 3004^2 + 7586^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55253 + ... + 56444.

It is an arithmetic number, because the mean of its divisors is an integer number (9773575).

Almost surely, 2^66571412 is an apocalyptic number.

It is an amenable number.

66571412 is a deficient number, since it is larger than the sum of its proper divisors (50711488).

66571412 is a wasteful number, since it uses less digits than its factorization.

66571412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111850 (or 111848 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 66571412 is about 8159.1305909392. The cubic root of 66571412 is about 405.2869216130.

Adding to 66571412 its reverse (21417566), we get a palindrome (87988978).

The spelling of 66571412 in words is "sixty-six million, five hundred seventy-one thousand, four hundred twelve".