640456483 has 2 divisors, whose sum is σ = 640456484. Its totient is φ = 640456482.

The previous prime is 640456477. The next prime is 640456493. The reversal of 640456483 is 384654046.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640456483 is a prime.

It is not a weakly prime, because it can be changed into another prime (640456403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320228241 + 320228242.

It is an arithmetic number, because the mean of its divisors is an integer number (320228242).

Almost surely, 2^640456483 is an apocalyptic number.

640456483 is a deficient number, since it is larger than the sum of its proper divisors (1).

640456483 is an equidigital number, since it uses as much as digits as its factorization.

640456483 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 40.

The square root of 640456483 is about 25307.2417106250. The cubic root of 640456483 is about 861.9787154051.

The spelling of 640456483 in words is "six hundred forty million, four hundred fifty-six thousand, four hundred eighty-three".