1661843343 has 8 divisors (see below), whose sum is σ = 2262935808. Its totient is φ = 1084323224.

The previous prime is 1661843329. The next prime is 1661843371. The reversal of 1661843343 is 3433481661.

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 1661843343 - 2⁴ = 1661843327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661843243) 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, 5892921 + ... + 5893202.

It is an arithmetic number, because the mean of its divisors is an integer number (282866976).

Almost surely, 2^1661843343 is an apocalyptic number.

1661843343 is a deficient number, since it is larger than the sum of its proper divisors (601092465).

1661843343 is a wasteful number, since it uses less digits than its factorization.

1661843343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11786173.

The product of its digits is 124416, while the sum is 39.

The square root of 1661843343 is about 40765.7128356662. The cubic root of 1661843343 is about 1184.4862598867.

The spelling of 1661843343 in words is "one billion, six hundred sixty-one million, eight hundred forty-three thousand, three hundred forty-three".