1659011993 has 2 divisors, whose sum is σ = 1659011994. Its totient is φ = 1659011992.

The previous prime is 1659011983. The next prime is 1659012007. The reversal of 1659011993 is 3991109561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1657466944 + 1545049 = 40712^2 + 1243^2 .

It is an emirp because it is prime and its reverse (3991109561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1659011993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1659011933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829505996 + 829505997.

It is an arithmetic number, because the mean of its divisors is an integer number (829505997).

Almost surely, 2^1659011993 is an apocalyptic number.

It is an amenable number.

1659011993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659011993 is an equidigital number, since it uses as much as digits as its factorization.

1659011993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 1659011993 is about 40730.9709312214. The cubic root of 1659011993 is about 1183.8131917142.

The spelling of 1659011993 in words is "one billion, six hundred fifty-nine million, eleven thousand, nine hundred ninety-three".