6665901 has 8 divisors (see below), whose sum is σ = 9695904. Its totient is φ = 4039920.

The previous prime is 6665881. The next prime is 6665909. The reversal of 6665901 is 1095666.

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

It is not a de Polignac number, because 6665901 - 2⁷ = 6665773 is a prime.

It is a super-2 number, since 2×6665901² = 88868472283602, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 201997 = 6665901 / (6 + 6 + 6 + 5 + 9 + 0 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100966 + ... + 101031.

It is an arithmetic number, because the mean of its divisors is an integer number (1211988).

Almost surely, 2^6665901 is an apocalyptic number.

It is an amenable number.

6665901 is a deficient number, since it is larger than the sum of its proper divisors (3030003).

6665901 is a wasteful number, since it uses less digits than its factorization.

6665901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202011.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 6665901 is about 2581.8406225017. The cubic root of 6665901 is about 188.2000003012.

The spelling of 6665901 in words is "six million, six hundred sixty-five thousand, nine hundred one".