66841087 has 2 divisors, whose sum is σ = 66841088. Its totient is φ = 66841086.

The previous prime is 66841079. The next prime is 66841123. The reversal of 66841087 is 78014866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66841087 - 2³ = 66841079 is a prime.

It is a super-2 number, since 2×66841087² = 8935461822683138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66841007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33420543 + 33420544.

It is an arithmetic number, because the mean of its divisors is an integer number (33420544).

Almost surely, 2^66841087 is an apocalyptic number.

66841087 is a deficient number, since it is larger than the sum of its proper divisors (1).

66841087 is an equidigital number, since it uses as much as digits as its factorization.

66841087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 66841087 is about 8175.6398526354. The cubic root of 66841087 is about 405.8334449930.

The spelling of 66841087 in words is "sixty-six million, eight hundred forty-one thousand, eighty-seven".