1661430541 has 8 divisors (see below), whose sum is σ = 1666119168. Its totient is φ = 1656750000.

The previous prime is 1661430493. The next prime is 1661430571. The reversal of 1661430541 is 1450341661.

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 1661430541 - 2¹¹ = 1661428493 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 (1661430571) 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, 705516 + ... + 707866.

It is an arithmetic number, because the mean of its divisors is an integer number (208264896).

Almost surely, 2^1661430541 is an apocalyptic number.

It is an amenable number.

1661430541 is a deficient number, since it is larger than the sum of its proper divisors (4688627).

1661430541 is an equidigital number, since it uses as much as digits as its factorization.

1661430541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4043.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1661430541 is about 40760.6494182809. The cubic root of 1661430541 is about 1184.3881762757.

The spelling of 1661430541 in words is "one billion, six hundred sixty-one million, four hundred thirty thousand, five hundred forty-one".