6669791 has 4 divisors (see below), whose sum is σ = 6761232. Its totient is φ = 6578352.

The previous prime is 6669781. The next prime is 6669809. The reversal of 6669791 is 1979666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6669791 is a prime.

It is a super-2 number, since 2×6669791² = 88972223967362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6669781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45611 + ... + 45756.

It is an arithmetic number, because the mean of its divisors is an integer number (1690308).

Almost surely, 2^6669791 is an apocalyptic number.

6669791 is a deficient number, since it is larger than the sum of its proper divisors (91441).

6669791 is an equidigital number, since it uses as much as digits as its factorization.

6669791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91440.

The product of its digits is 122472, while the sum is 44.

The square root of 6669791 is about 2582.5938511504. The cubic root of 6669791 is about 188.2366022868.

The spelling of 6669791 in words is "six million, six hundred sixty-nine thousand, seven hundred ninety-one".