645534323441 has 8 divisors (see below), whose sum is σ = 740919838464. Its totient is φ = 550940389920.

The previous prime is 645534323407. The next prime is 645534323501. The reversal of 645534323441 is 144323435546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645534323441 - 2⁶ = 645534323377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645534323392 and 645534323401.

It is not an unprimeable number, because it can be changed into a prime (645534322441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197893625 + ... + 197896886.

It is an arithmetic number, because the mean of its divisors is an integer number (92614979808).

Almost surely, 2^645534323441 is an apocalyptic number.

It is an amenable number.

645534323441 is a deficient number, since it is larger than the sum of its proper divisors (95385515023).

645534323441 is a wasteful number, since it uses less digits than its factorization.

645534323441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395790751.

The product of its digits is 2073600, while the sum is 44.

Adding to 645534323441 its reverse (144323435546), we get a palindrome (789857758987).

The spelling of 645534323441 in words is "six hundred forty-five billion, five hundred thirty-four million, three hundred twenty-three thousand, four hundred forty-one".