66637022069 has 2 divisors, whose sum is σ = 66637022070. Its totient is φ = 66637022068.

The previous prime is 66637022003. The next prime is 66637022171. The reversal of 66637022069 is 96022073666.

It is a happy number.

66637022069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58230516100 + 8406505969 = 241310^2 + 91687^2 .

It is a cyclic number.

It is not a de Polignac number, because 66637022069 - 2³² = 62342054773 is a prime.

It is a super-2 number, since 2×66637022069² (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 (66637025069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33318511034 + 33318511035.

It is an arithmetic number, because the mean of its divisors is an integer number (33318511035).

Almost surely, 2^66637022069 is an apocalyptic number.

It is an amenable number.

66637022069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66637022069 is an equidigital number, since it uses as much as digits as its factorization.

66637022069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 47.

The spelling of 66637022069 in words is "sixty-six billion, six hundred thirty-seven million, twenty-two thousand, sixty-nine".