66600621029 has 2 divisors, whose sum is σ = 66600621030. Its totient is φ = 66600621028.

The previous prime is 66600621001. The next prime is 66600621049. The reversal of 66600621029 is 92012600666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66253730404 + 346890625 = 257398^2 + 18625^2 .

It is a cyclic number.

It is not a de Polignac number, because 66600621029 - 2⁸ = 66600620773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66600620983 and 66600621001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66600621049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33300310514 + 33300310515.

It is an arithmetic number, because the mean of its divisors is an integer number (33300310515).

Almost surely, 2^66600621029 is an apocalyptic number.

It is an amenable number.

66600621029 is a deficient number, since it is larger than the sum of its proper divisors (1).

66600621029 is an equidigital number, since it uses as much as digits as its factorization.

66600621029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 66600621029 in words is "sixty-six billion, six hundred million, six hundred twenty-one thousand, twenty-nine".