640253461007 has 2 divisors, whose sum is σ = 640253461008. Its totient is φ = 640253461006.

The previous prime is 640253460991. The next prime is 640253461009. The reversal of 640253461007 is 700164352046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640253461007 - 2⁴ = 640253460991 is a prime.

Together with 640253461009, 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 (640253461009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320126730503 + 320126730504.

It is an arithmetic number, because the mean of its divisors is an integer number (320126730504).

Almost surely, 2^640253461007 is an apocalyptic number.

640253461007 is a deficient number, since it is larger than the sum of its proper divisors (1).

640253461007 is an equidigital number, since it uses as much as digits as its factorization.

640253461007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 640253461007 in words is "six hundred forty billion, two hundred fifty-three million, four hundred sixty-one thousand, seven".