645606450326 has 4 divisors (see below), whose sum is σ = 968409675492. Its totient is φ = 322803225162.

The previous prime is 645606450271. The next prime is 645606450343. The reversal of 645606450326 is 623054606546.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161401612580 + ... + 161401612583.

It is an arithmetic number, because the mean of its divisors is an integer number (242102418873).

Almost surely, 2^645606450326 is an apocalyptic number.

645606450326 is a deficient number, since it is larger than the sum of its proper divisors (322803225166).

645606450326 is a wasteful number, since it uses less digits than its factorization.

645606450326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322803225165.

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 645606450326 in words is "six hundred forty-five billion, six hundred six million, four hundred fifty thousand, three hundred twenty-six".