640604101001 has 2 divisors, whose sum is σ = 640604101002. Its totient is φ = 640604101000.

The previous prime is 640604100979. The next prime is 640604101073. The reversal of 640604101001 is 100101406046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388222455625 + 252381645376 = 623075^2 + 502376^2 .

It is a cyclic number.

It is not a de Polignac number, because 640604101001 - 2¹⁸ = 640603838857 is a prime.

It is a super-2 number, since 2×640604101001² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640604101601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320302050500 + 320302050501.

It is an arithmetic number, because the mean of its divisors is an integer number (320302050501).

Almost surely, 2^640604101001 is an apocalyptic number.

It is an amenable number.

640604101001 is a deficient number, since it is larger than the sum of its proper divisors (1).

640604101001 is an equidigital number, since it uses as much as digits as its factorization.

640604101001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 640604101001 its reverse (100101406046), we get a palindrome (740705507047).

The spelling of 640604101001 in words is "six hundred forty billion, six hundred four million, one hundred one thousand, one".