66910005 has 24 divisors (see below), whose sum is σ = 116239968. Its totient is φ = 35604576.

The previous prime is 66909979. The next prime is 66910007. The reversal of 66910005 is 50001966.

It is not a de Polignac number, because 66910005 - 2¹⁰ = 66908981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66910007) 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 in 23 ways as a sum of consecutive naturals, for example, 22114 + ... + 24956.

It is an arithmetic number, because the mean of its divisors is an integer number (4843332).

Almost surely, 2^66910005 is an apocalyptic number.

It is an amenable number.

66910005 is a deficient number, since it is larger than the sum of its proper divisors (49329963).

66910005 is a wasteful number, since it uses less digits than its factorization.

66910005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377 (or 3374 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 66910005 is about 8179.8536050470. The cubic root of 66910005 is about 405.9728783034.

The spelling of 66910005 in words is "sixty-six million, nine hundred ten thousand, five".