666010385 has 8 divisors (see below), whose sum is σ = 799544616. Its totient is φ = 532586880.

The previous prime is 666010357. The next prime is 666010393. The reversal of 666010385 is 583010666.

It can be written as a sum of positive squares in 4 ways, for example, as 114746944 + 551263441 = 10712^2 + 23479^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666010385 - 2²² = 661816081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13814 + ... + 39023.

It is an arithmetic number, because the mean of its divisors is an integer number (99943077).

Almost surely, 2^666010385 is an apocalyptic number.

It is an amenable number.

666010385 is a deficient number, since it is larger than the sum of its proper divisors (133534231).

666010385 is a wasteful number, since it uses less digits than its factorization.

666010385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55363.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 666010385 is about 25807.1770056316. The cubic root of 666010385 is about 873.2937131991.

The spelling of 666010385 in words is "six hundred sixty-six million, ten thousand, three hundred eighty-five".