645466793 has 2 divisors, whose sum is σ = 645466794. Its totient is φ = 645466792.

The previous prime is 645466781. The next prime is 645466837. The reversal of 645466793 is 397664546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524730649 + 120736144 = 22907^2 + 10988^2 .

It is a cyclic number.

It is not a de Polignac number, because 645466793 - 2⁶ = 645466729 is a prime.

It is not a weakly prime, because it can be changed into another prime (645466753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322733396 + 322733397.

It is an arithmetic number, because the mean of its divisors is an integer number (322733397).

Almost surely, 2^645466793 is an apocalyptic number.

It is an amenable number.

645466793 is a deficient number, since it is larger than the sum of its proper divisors (1).

645466793 is an equidigital number, since it uses as much as digits as its factorization.

645466793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 50.

The square root of 645466793 is about 25406.0385144949. The cubic root of 645466793 is about 864.2206409699.

The spelling of 645466793 in words is "six hundred forty-five million, four hundred sixty-six thousand, seven hundred ninety-three".