645134404241 has 4 divisors (see below), whose sum is σ = 645145515300. Its totient is φ = 645123293184.

The previous prime is 645134404207. The next prime is 645134404247. The reversal of 645134404241 is 142404431546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 384519049216 + 260615355025 = 620096^2 + 510505^2 .

It is a cyclic number.

It is not a de Polignac number, because 645134404241 - 2²² = 645130209937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645134404195 and 645134404204.

It is not an unprimeable number, because it can be changed into a prime (645134404247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5467976 + ... + 5584713.

It is an arithmetic number, because the mean of its divisors is an integer number (161286378825).

Almost surely, 2^645134404241 is an apocalyptic number.

It is an amenable number.

645134404241 is a deficient number, since it is larger than the sum of its proper divisors (11111059).

645134404241 is a wasteful number, since it uses less digits than its factorization.

645134404241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111058.

The product of its (nonzero) digits is 184320, while the sum is 38.

Adding to 645134404241 its reverse (142404431546), we get a palindrome (787538835787).

The spelling of 645134404241 in words is "six hundred forty-five billion, one hundred thirty-four million, four hundred four thousand, two hundred forty-one".