666701001 has 12 divisors (see below), whose sum is σ = 964304640. Its totient is φ = 443871000.

The previous prime is 666700967. The next prime is 666701027. The reversal of 666701001 is 100107666.

It is not a de Polignac number, because 666701001 - 2⁷ = 666700873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666701071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42561 + ... + 56078.

It is an arithmetic number, because the mean of its divisors is an integer number (80358720).

Almost surely, 2^666701001 is an apocalyptic number.

It is an amenable number.

666701001 is a deficient number, since it is larger than the sum of its proper divisors (297603639).

666701001 is a wasteful number, since it uses less digits than its factorization.

666701001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99396 (or 99393 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 666701001 is about 25820.5538476617. The cubic root of 666701001 is about 873.5954613803.

Adding to 666701001 its reverse (100107666), we get a palindrome (766808667).

The spelling of 666701001 in words is "six hundred sixty-six million, seven hundred one thousand, one".