6691042061 has 8 divisors (see below), whose sum is σ = 7302546048. Its totient is φ = 6080076000.

The previous prime is 6691042013. The next prime is 6691042091. The reversal of 6691042061 is 1602401966.

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 6691042061 - 2⁶ = 6691041997 is a prime.

It is a super-2 number, since 2×6691042061² = 89540087724142255442, 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 (6691042091) 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, 108245 + ... + 158426.

It is an arithmetic number, because the mean of its divisors is an integer number (912818256).

Almost surely, 2^6691042061 is an apocalyptic number.

It is an amenable number.

6691042061 is a deficient number, since it is larger than the sum of its proper divisors (611503987).

6691042061 is a wasteful number, since it uses less digits than its factorization.

6691042061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268963.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 6691042061 is about 81798.7900949641. The cubic root of 6691042061 is about 1884.3630802264.

The spelling of 6691042061 in words is "six billion, six hundred ninety-one million, forty-two thousand, sixty-one".