6662991 has 8 divisors (see below), whose sum is σ = 8991360. Its totient is φ = 4388312.

The previous prime is 6662989. The next prime is 6662993. The reversal of 6662991 is 1992666.

It is an interprime number because it is at equal distance from previous prime (6662989) and next prime (6662993).

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

It is a cyclic number.

It is not a de Polignac number, because 6662991 - 2¹ = 6662989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6662993) 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, 13131 + ... + 13628.

It is an arithmetic number, because the mean of its divisors is an integer number (1123920).

Almost surely, 2^6662991 is an apocalyptic number.

6662991 is a deficient number, since it is larger than the sum of its proper divisors (2328369).

6662991 is a wasteful number, since it uses less digits than its factorization.

6662991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26845.

The product of its digits is 34992, while the sum is 39.

The square root of 6662991 is about 2581.2770095439. The cubic root of 6662991 is about 188.1726100697.

The spelling of 6662991 in words is "six million, six hundred sixty-two thousand, nine hundred ninety-one".