645415122511 has 2 divisors, whose sum is σ = 645415122512. Its totient is φ = 645415122510.

The previous prime is 645415122509. The next prime is 645415122529. The reversal of 645415122511 is 115221514546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645415122511 - 2¹ = 645415122509 is a prime.

Together with 645415122509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645415122581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322707561255 + 322707561256.

It is an arithmetic number, because the mean of its divisors is an integer number (322707561256).

Almost surely, 2^645415122511 is an apocalyptic number.

645415122511 is a deficient number, since it is larger than the sum of its proper divisors (1).

645415122511 is an equidigital number, since it uses as much as digits as its factorization.

645415122511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48000, while the sum is 37.

The spelling of 645415122511 in words is "six hundred forty-five billion, four hundred fifteen million, one hundred twenty-two thousand, five hundred eleven".