66207481 has 2 divisors, whose sum is σ = 66207482. Its totient is φ = 66207480.

The previous prime is 66207439. The next prime is 66207521. The reversal of 66207481 is 18470266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40755456 + 25452025 = 6384^2 + 5045^2 .

It is a cyclic number.

It is not a de Polignac number, because 66207481 - 2⁷ = 66207353 is a prime.

It is a super-2 number, since 2×66207481² = 8766861080730722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66207431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33103740 + 33103741.

It is an arithmetic number, because the mean of its divisors is an integer number (33103741).

Almost surely, 2^66207481 is an apocalyptic number.

It is an amenable number.

66207481 is a deficient number, since it is larger than the sum of its proper divisors (1).

66207481 is an equidigital number, since it uses as much as digits as its factorization.

66207481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66207481 is about 8136.7979574277. The cubic root of 66207481 is about 404.5470340934.

The spelling of 66207481 in words is "sixty-six million, two hundred seven thousand, four hundred eighty-one".