6661975 has 6 divisors (see below), whose sum is σ = 8260880. Its totient is φ = 5329560.

The previous prime is 6661957. The next prime is 6661987. The reversal of 6661975 is 5791666.

It is not a de Polignac number, because 6661975 - 2¹⁷ = 6530903 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133215 + ... + 133264.

Almost surely, 2^6661975 is an apocalyptic number.

6661975 is a deficient number, since it is larger than the sum of its proper divisors (1598905).

6661975 is a wasteful number, since it uses less digits than its factorization.

6661975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266489 (or 266484 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 6661975 is about 2581.0802002263. The cubic root of 6661975 is about 188.1630451415.

The spelling of 6661975 in words is "six million, six hundred sixty-one thousand, nine hundred seventy-five".