664042702243 has 2 divisors, whose sum is σ = 664042702244. Its totient is φ = 664042702242.

The previous prime is 664042702189. The next prime is 664042702249. The reversal of 664042702243 is 342207240466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664042702243 - 2²¹ = 664040605091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664042702196 and 664042702205.

It is not a weakly prime, because it can be changed into another prime (664042702249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332021351121 + 332021351122.

It is an arithmetic number, because the mean of its divisors is an integer number (332021351122).

Almost surely, 2^664042702243 is an apocalyptic number.

664042702243 is a deficient number, since it is larger than the sum of its proper divisors (1).

664042702243 is an equidigital number, since it uses as much as digits as its factorization.

664042702243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 40.

The spelling of 664042702243 in words is "six hundred sixty-four billion, forty-two million, seven hundred two thousand, two hundred forty-three".