1661624143 has 8 divisors (see below), whose sum is σ = 1684474880. Its totient is φ = 1638819000.

The previous prime is 1661624141. The next prime is 1661624171. The reversal of 1661624143 is 3414261661.

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 1661624143 - 2¹ = 1661624141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661624099 and 1661624108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661624141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65518 + ... + 87268.

It is an arithmetic number, because the mean of its divisors is an integer number (210559360).

Almost surely, 2^1661624143 is an apocalyptic number.

1661624143 is a deficient number, since it is larger than the sum of its proper divisors (22850737).

1661624143 is an equidigital number, since it uses as much as digits as its factorization.

1661624143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22797.

The product of its digits is 20736, while the sum is 34.

The square root of 1661624143 is about 40763.0242131273. The cubic root of 1661624143 is about 1184.4341790040.

The spelling of 1661624143 in words is "one billion, six hundred sixty-one million, six hundred twenty-four thousand, one hundred forty-three".