66866307601 has 2 divisors, whose sum is σ = 66866307602. Its totient is φ = 66866307600.

The previous prime is 66866307583. The next prime is 66866307617. The reversal of 66866307601 is 10670366866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66357760000 + 508547601 = 257600^2 + 22551^2 .

It is a cyclic number.

It is not a de Polignac number, because 66866307601 - 2¹¹ = 66866305553 is a prime.

It is a super-2 number, since 2×66866307601² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66866307301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33433153800 + 33433153801.

It is an arithmetic number, because the mean of its divisors is an integer number (33433153801).

Almost surely, 2^66866307601 is an apocalyptic number.

It is an amenable number.

66866307601 is a deficient number, since it is larger than the sum of its proper divisors (1).

66866307601 is an equidigital number, since it uses as much as digits as its factorization.

66866307601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 66866307601 in words is "sixty-six billion, eight hundred sixty-six million, three hundred seven thousand, six hundred one".