66060602381 has 2 divisors, whose sum is σ = 66060602382. Its totient is φ = 66060602380.

The previous prime is 66060602341. The next prime is 66060602411. The reversal of 66060602381 is 18320606066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64900110025 + 1160492356 = 254755^2 + 34066^2 .

It is a cyclic number.

It is not a de Polignac number, because 66060602381 - 2³⁰ = 64986860557 is a prime.

It is a super-2 number, since 2×66060602381² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66060602341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33030301190 + 33030301191.

It is an arithmetic number, because the mean of its divisors is an integer number (33030301191).

Almost surely, 2^66060602381 is an apocalyptic number.

It is an amenable number.

66060602381 is a deficient number, since it is larger than the sum of its proper divisors (1).

66060602381 is an equidigital number, since it uses as much as digits as its factorization.

66060602381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 66060602381 in words is "sixty-six billion, sixty million, six hundred two thousand, three hundred eighty-one".