1664233243 has 2 divisors, whose sum is σ = 1664233244. Its totient is φ = 1664233242.

The previous prime is 1664233217. The next prime is 1664233267. The reversal of 1664233243 is 3423324661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664233243 - 2¹³ = 1664225051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664233199 and 1664233208.

It is not a weakly prime, because it can be changed into another prime (1664233213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832116621 + 832116622.

It is an arithmetic number, because the mean of its divisors is an integer number (832116622).

Almost surely, 2^1664233243 is an apocalyptic number.

1664233243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664233243 is an equidigital number, since it uses as much as digits as its factorization.

1664233243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 34.

The square root of 1664233243 is about 40795.0149282973. The cubic root of 1664233243 is about 1185.0537918812.

The spelling of 1664233243 in words is "one billion, six hundred sixty-four million, two hundred thirty-three thousand, two hundred forty-three".