664458869 has 2 divisors, whose sum is σ = 664458870. Its totient is φ = 664458868.

The previous prime is 664458863. The next prime is 664458943. The reversal of 664458869 is 968854466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497067025 + 167391844 = 22295^2 + 12938^2 .

It is a cyclic number.

It is not a de Polignac number, because 664458869 - 2¹² = 664454773 is a prime.

It is a super-2 number, since 2×664458869² = 883011177185518322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664458863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332229434 + 332229435.

It is an arithmetic number, because the mean of its divisors is an integer number (332229435).

Almost surely, 2^664458869 is an apocalyptic number.

It is an amenable number.

664458869 is a deficient number, since it is larger than the sum of its proper divisors (1).

664458869 is an equidigital number, since it uses as much as digits as its factorization.

664458869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 56.

The square root of 664458869 is about 25777.0997010913. The cubic root of 664458869 is about 872.6150537788.

The spelling of 664458869 in words is "six hundred sixty-four million, four hundred fifty-eight thousand, eight hundred sixty-nine".