640366127 has 2 divisors, whose sum is σ = 640366128. Its totient is φ = 640366126.

The previous prime is 640366099. The next prime is 640366169. The reversal of 640366127 is 721663046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640366127 - 2⁸ = 640365871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640366327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320183063 + 320183064.

It is an arithmetic number, because the mean of its divisors is an integer number (320183064).

Almost surely, 2^640366127 is an apocalyptic number.

640366127 is a deficient number, since it is larger than the sum of its proper divisors (1).

640366127 is an equidigital number, since it uses as much as digits as its factorization.

640366127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 640366127 is about 25305.4564669361. The cubic root of 640366127 is about 861.9381773338.

The spelling of 640366127 in words is "six hundred forty million, three hundred sixty-six thousand, one hundred twenty-seven".