666758385 has 80 divisors (see below), whose sum is σ = 1287982080. Its totient is φ = 329028480.

The previous prime is 666758383. The next prime is 666758399. The reversal of 666758385 is 583857666.

It is not a de Polignac number, because 666758385 - 2¹ = 666758383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666758381) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 287611 + ... + 289919.

It is an arithmetic number, because the mean of its divisors is an integer number (16099776).

Almost surely, 2^666758385 is an apocalyptic number.

It is an amenable number.

666758385 is a deficient number, since it is larger than the sum of its proper divisors (621223695).

666758385 is a wasteful number, since it uses less digits than its factorization.

666758385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380 (or 2371 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 666758385 is about 25821.6650315196. The cubic root of 666758385 is about 873.6205245714.

The spelling of 666758385 in words is "six hundred sixty-six million, seven hundred fifty-eight thousand, three hundred eighty-five".