1659920543 has 2 divisors, whose sum is σ = 1659920544. Its totient is φ = 1659920542.

The previous prime is 1659920527. The next prime is 1659920567. The reversal of 1659920543 is 3450299561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1659920543 - 2⁴ = 1659920527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1659920494 and 1659920503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1659820543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829960271 + 829960272.

It is an arithmetic number, because the mean of its divisors is an integer number (829960272).

Almost surely, 2^1659920543 is an apocalyptic number.

1659920543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659920543 is an equidigital number, since it uses as much as digits as its factorization.

1659920543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 1659920543 is about 40742.1224655761. The cubic root of 1659920543 is about 1184.0292554917.

The spelling of 1659920543 in words is "one billion, six hundred fifty-nine million, nine hundred twenty thousand, five hundred forty-three".