640510004261 has 2 divisors, whose sum is σ = 640510004262. Its totient is φ = 640510004260.

The previous prime is 640510004221. The next prime is 640510004263. The reversal of 640510004261 is 162400015046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578084981761 + 62425022500 = 760319^2 + 249850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640510004261 is a prime.

It is a super-2 number, since 2×640510004261² (a number of 24 digits) contains 22 as substring.

Together with 640510004263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640510004263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320255002130 + 320255002131.

It is an arithmetic number, because the mean of its divisors is an integer number (320255002131).

Almost surely, 2^640510004261 is an apocalyptic number.

It is an amenable number.

640510004261 is a deficient number, since it is larger than the sum of its proper divisors (1).

640510004261 is an equidigital number, since it uses as much as digits as its factorization.

640510004261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 640510004261 in words is "six hundred forty billion, five hundred ten million, four thousand, two hundred sixty-one".