640125763 has 2 divisors, whose sum is σ = 640125764. Its totient is φ = 640125762.

The previous prime is 640125749. The next prime is 640125791. The reversal of 640125763 is 367521046.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640125763 is a prime.

It is not a weakly prime, because it can be changed into another prime (640126763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320062881 + 320062882.

It is an arithmetic number, because the mean of its divisors is an integer number (320062882).

Almost surely, 2^640125763 is an apocalyptic number.

640125763 is a deficient number, since it is larger than the sum of its proper divisors (1).

640125763 is an equidigital number, since it uses as much as digits as its factorization.

640125763 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 640125763 is about 25300.7067687841. The cubic root of 640125763 is about 861.8303198512.

The spelling of 640125763 in words is "six hundred forty million, one hundred twenty-five thousand, seven hundred sixty-three".