66671351 has 2 divisors, whose sum is σ = 66671352. Its totient is φ = 66671350.

The previous prime is 66671347. The next prime is 66671389. The reversal of 66671351 is 15317666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66671351 - 2² = 66671347 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66671321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335675 + 33335676.

It is an arithmetic number, because the mean of its divisors is an integer number (33335676).

Almost surely, 2^66671351 is an apocalyptic number.

66671351 is a deficient number, since it is larger than the sum of its proper divisors (1).

66671351 is an equidigital number, since it uses as much as digits as its factorization.

66671351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 66671351 is about 8165.2526598998. The cubic root of 66671351 is about 405.4896298363.

The spelling of 66671351 in words is "sixty-six million, six hundred seventy-one thousand, three hundred fifty-one".