640060637 has 2 divisors, whose sum is σ = 640060638. Its totient is φ = 640060636.

The previous prime is 640060601. The next prime is 640060639. The reversal of 640060637 is 736060046.

640060637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337787641 + 302272996 = 18379^2 + 17386^2 .

It is a cyclic number.

It is not a de Polignac number, because 640060637 - 2⁸ = 640060381 is a prime.

Together with 640060639, 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 (640060639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320030318 + 320030319.

It is an arithmetic number, because the mean of its divisors is an integer number (320030319).

Almost surely, 2^640060637 is an apocalyptic number.

It is an amenable number.

640060637 is a deficient number, since it is larger than the sum of its proper divisors (1).

640060637 is an equidigital number, since it uses as much as digits as its factorization.

640060637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 640060637 is about 25299.4196969021. The cubic root of 640060637 is about 861.8010914983.

The spelling of 640060637 in words is "six hundred forty million, sixty thousand, six hundred thirty-seven".