645301403441 has 4 divisors (see below), whose sum is σ = 645341823984. Its totient is φ = 645260982900.

The previous prime is 645301403437. The next prime is 645301403449. The reversal of 645301403441 is 144304103546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144304103546 = 2 ⋅72152051773.

It is a cyclic number.

It is not a de Polignac number, because 645301403441 - 2² = 645301403437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645301403449) 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, 20186315 + ... + 20218256.

It is an arithmetic number, because the mean of its divisors is an integer number (161335455996).

Almost surely, 2^645301403441 is an apocalyptic number.

It is an amenable number.

645301403441 is a deficient number, since it is larger than the sum of its proper divisors (40420543).

645301403441 is a wasteful number, since it uses less digits than its factorization.

645301403441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40420542.

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 645301403441 its reverse (144304103546), we get a palindrome (789605506987).

The spelling of 645301403441 in words is "six hundred forty-five billion, three hundred one million, four hundred three thousand, four hundred forty-one".