664873141 has 2 divisors, whose sum is σ = 664873142. Its totient is φ = 664873140.

The previous prime is 664873133. The next prime is 664873159. The reversal of 664873141 is 141378466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497067025 + 167806116 = 22295^2 + 12954^2 .

It is a cyclic number.

It is not a de Polignac number, because 664873141 - 2³ = 664873133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664873094 and 664873103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664873241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332436570 + 332436571.

It is an arithmetic number, because the mean of its divisors is an integer number (332436571).

Almost surely, 2^664873141 is an apocalyptic number.

It is an amenable number.

664873141 is a deficient number, since it is larger than the sum of its proper divisors (1).

664873141 is an equidigital number, since it uses as much as digits as its factorization.

664873141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 664873141 is about 25785.1341086293. The cubic root of 664873141 is about 872.7963666727.

The spelling of 664873141 in words is "six hundred sixty-four million, eight hundred seventy-three thousand, one hundred forty-one".