6691641 has 8 divisors (see below), whose sum is σ = 9733344. Its totient is φ = 4055520.

The previous prime is 6691637. The next prime is 6691661. The reversal of 6691641 is 1461966.

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

It is not a de Polignac number, because 6691641 - 2² = 6691637 is a prime.

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: 202777 = 6691641 / (6 + 6 + 9 + 1 + 6 + 4 + 1).

It is not an unprimeable number, because it can be changed into a prime (6691631) 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, 101356 + ... + 101421.

It is an arithmetic number, because the mean of its divisors is an integer number (1216668).

Almost surely, 2^6691641 is an apocalyptic number.

It is an amenable number.

6691641 is a deficient number, since it is larger than the sum of its proper divisors (3041703).

6691641 is a wasteful number, since it uses less digits than its factorization.

6691641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202791.

The product of its digits is 7776, while the sum is 33.

The square root of 6691641 is about 2586.8206354519. The cubic root of 6691641 is about 188.4419303899.

The spelling of 6691641 in words is "six million, six hundred ninety-one thousand, six hundred forty-one".