66572141 has 2 divisors, whose sum is σ = 66572142. Its totient is φ = 66572140.

The previous prime is 66572137. The next prime is 66572171. The reversal of 66572141 is 14127566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66015625 + 556516 = 8125^2 + 746^2 .

It is a cyclic number.

It is not a de Polignac number, because 66572141 - 2² = 66572137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66572098 and 66572107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66572111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286070 + 33286071.

It is an arithmetic number, because the mean of its divisors is an integer number (33286071).

Almost surely, 2^66572141 is an apocalyptic number.

It is an amenable number.

66572141 is a deficient number, since it is larger than the sum of its proper divisors (1).

66572141 is an equidigital number, since it uses as much as digits as its factorization.

66572141 is an evil number, because the sum of its binary digits is even.

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

The square root of 66572141 is about 8159.1752646943. The cubic root of 66572141 is about 405.2884009922.

The spelling of 66572141 in words is "sixty-six million, five hundred seventy-two thousand, one hundred forty-one".