6661343261 has 8 divisors (see below), whose sum is σ = 6703361280. Its totient is φ = 6619350928.

The previous prime is 6661343243. The next prime is 6661343263. The reversal of 6661343261 is 1623431666.

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 6661343261 - 2⁶ = 6661343197 is a prime.

It is a super-2 number, since 2×6661343261² = 88746988081740228242, 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 (6661343263) 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, 966335 + ... + 973203.

It is an arithmetic number, because the mean of its divisors is an integer number (837920160).

Almost surely, 2^6661343261 is an apocalyptic number.

It is an amenable number.

6661343261 is a deficient number, since it is larger than the sum of its proper divisors (42018019).

6661343261 is a wasteful number, since it uses less digits than its factorization.

6661343261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12843.

The product of its digits is 93312, while the sum is 38.

The square root of 6661343261 is about 81617.0525135526. The cubic root of 6661343261 is about 1881.5709727116.

The spelling of 6661343261 in words is "six billion, six hundred sixty-one million, three hundred forty-three thousand, two hundred sixty-one".