1661044343 has 8 divisors (see below), whose sum is σ = 1938726912. Its totient is φ = 1393459416.

The previous prime is 1661044321. The next prime is 1661044349. The reversal of 1661044343 is 3434401661.

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 1661044343 - 2¹⁶ = 1660978807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661044349) 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, 2524055 + ... + 2524712.

It is an arithmetic number, because the mean of its divisors is an integer number (242340864).

Almost surely, 2^1661044343 is an apocalyptic number.

1661044343 is a deficient number, since it is larger than the sum of its proper divisors (277682569).

1661044343 is an equidigital number, since it uses as much as digits as its factorization.

1661044343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048821.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 1661044343 is about 40755.9117552288. The cubic root of 1661044343 is about 1184.2963991836.

The spelling of 1661044343 in words is "one billion, six hundred sixty-one million, forty-four thousand, three hundred forty-three".