66840197051 has 2 divisors, whose sum is σ = 66840197052. Its totient is φ = 66840197050.

The previous prime is 66840197003. The next prime is 66840197063. The reversal of 66840197051 is 15079104866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66840197051 - 2¹⁸ = 66839934907 is a prime.

It is a super-2 number, since 2×66840197051² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 66840196987 and 66840197005.

It is not a weakly prime, because it can be changed into another prime (66840197951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33420098525 + 33420098526.

It is an arithmetic number, because the mean of its divisors is an integer number (33420098526).

Almost surely, 2^66840197051 is an apocalyptic number.

66840197051 is a deficient number, since it is larger than the sum of its proper divisors (1).

66840197051 is an equidigital number, since it uses as much as digits as its factorization.

66840197051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 66840197051 in words is "sixty-six billion, eight hundred forty million, one hundred ninety-seven thousand, fifty-one".