66536671 has 2 divisors, whose sum is σ = 66536672. Its totient is φ = 66536670.

The previous prime is 66536669. The next prime is 66536683. The reversal of 66536671 is 17663566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66536671 - 2¹ = 66536669 is a prime.

Together with 66536669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66536611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33268335 + 33268336.

It is an arithmetic number, because the mean of its divisors is an integer number (33268336).

Almost surely, 2^66536671 is an apocalyptic number.

66536671 is a deficient number, since it is larger than the sum of its proper divisors (1).

66536671 is an equidigital number, since it uses as much as digits as its factorization.

66536671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 66536671 is about 8157.0013485349. The cubic root of 66536671 is about 405.2164082474.

The spelling of 66536671 in words is "sixty-six million, five hundred thirty-six thousand, six hundred seventy-one".