66872371 has 2 divisors, whose sum is σ = 66872372. Its totient is φ = 66872370.

The previous prime is 66872359. The next prime is 66872387. The reversal of 66872371 is 17327866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66872371 - 2⁹ = 66871859 is a prime.

It is not a weakly prime, because it can be changed into another prime (66872321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33436185 + 33436186.

It is an arithmetic number, because the mean of its divisors is an integer number (33436186).

Almost surely, 2^66872371 is an apocalyptic number.

66872371 is a deficient number, since it is larger than the sum of its proper divisors (1).

66872371 is an equidigital number, since it uses as much as digits as its factorization.

66872371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 66872371 is about 8177.5528735680. The cubic root of 66872371 is about 405.8967499343.

The spelling of 66872371 in words is "sixty-six million, eight hundred seventy-two thousand, three hundred seventy-one".