1659820543 has 2 divisors, whose sum is σ = 1659820544. Its totient is φ = 1659820542.

The previous prime is 1659820537. The next prime is 1659820549. The reversal of 1659820543 is 3450289561.

It is a balanced prime because it is at equal distance from previous prime (1659820537) and next prime (1659820549).

It is an emirp because it is prime and its reverse (3450289561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1659820543 - 2²¹ = 1657723391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1659820543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1659820549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829910271 + 829910272.

It is an arithmetic number, because the mean of its divisors is an integer number (829910272).

Almost surely, 2^1659820543 is an apocalyptic number.

1659820543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659820543 is an equidigital number, since it uses as much as digits as its factorization.

1659820543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 1659820543 is about 40740.8952159866. The cubic root of 1659820543 is about 1184.0054781883.

The spelling of 1659820543 in words is "one billion, six hundred fifty-nine million, eight hundred twenty thousand, five hundred forty-three".