66372881651971 has 2 divisors, whose sum is σ = 66372881651972. Its totient is φ = 66372881651970.

The previous prime is 66372881651969. The next prime is 66372881652001. The reversal of 66372881651971 is 17915618827366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66372881651971 - 2¹ = 66372881651969 is a prime.

Together with 66372881651969, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66372881651971.

It is not a weakly prime, because it can be changed into another prime (66372881651771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33186440825985 + 33186440825986.

It is an arithmetic number, because the mean of its divisors is an integer number (33186440825986).

Almost surely, 2^{66372881651971} is an apocalyptic number.

66372881651971 is a deficient number, since it is larger than the sum of its proper divisors (1).

66372881651971 is an equidigital number, since it uses as much as digits as its factorization.

66372881651971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 182891520, while the sum is 70.

The spelling of 66372881651971 in words is "sixty-six trillion, three hundred seventy-two billion, eight hundred eighty-one million, six hundred fifty-one thousand, nine hundred seventy-one".