645650207011 has 2 divisors, whose sum is σ = 645650207012. Its totient is φ = 645650207010.

The previous prime is 645650206991. The next prime is 645650207021. The reversal of 645650207011 is 110702056546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645650207011 - 2⁹ = 645650206499 is a prime.

It is not a weakly prime, because it can be changed into another prime (645650207021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322825103505 + 322825103506.

It is an arithmetic number, because the mean of its divisors is an integer number (322825103506).

Almost surely, 2^645650207011 is an apocalyptic number.

645650207011 is a deficient number, since it is larger than the sum of its proper divisors (1).

645650207011 is an equidigital number, since it uses as much as digits as its factorization.

645650207011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 645650207011 in words is "six hundred forty-five billion, six hundred fifty million, two hundred seven thousand, eleven".