664350432032501 has 2 divisors, whose sum is σ = 664350432032502. Its totient is φ = 664350432032500.

The previous prime is 664350432032489. The next prime is 664350432032531. The reversal of 664350432032501 is 105230234053466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663444994145476 + 905437887025 = 25757426^2 + 951545^2 .

It is a cyclic number.

It is not a de Polignac number, because 664350432032501 - 2¹⁸ = 664350431770357 is a prime.

It is a super-2 number, since 2×664350432032501² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664350432032531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332175216016250 + 332175216016251.

It is an arithmetic number, because the mean of its divisors is an integer number (332175216016251).

Almost surely, 2^{664350432032501} is an apocalyptic number.

It is an amenable number.

664350432032501 is a deficient number, since it is larger than the sum of its proper divisors (1).

664350432032501 is an equidigital number, since it uses as much as digits as its factorization.

664350432032501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 44.

Adding to 664350432032501 its reverse (105230234053466), we get a palindrome (769580666085967).

The spelling of 664350432032501 in words is "six hundred sixty-four trillion, three hundred fifty billion, four hundred thirty-two million, thirty-two thousand, five hundred one".