645650440606 has 4 divisors (see below), whose sum is σ = 968475660912. Its totient is φ = 322825220302.

The previous prime is 645650440579. The next prime is 645650440607. The reversal of 645650440606 is 606044056546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645650440607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161412610150 + ... + 161412610153.

It is an arithmetic number, because the mean of its divisors is an integer number (242118915228).

Almost surely, 2^645650440606 is an apocalyptic number.

645650440606 is a deficient number, since it is larger than the sum of its proper divisors (322825220306).

645650440606 is a wasteful number, since it uses less digits than its factorization.

645650440606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322825220305.

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 645650440606 in words is "six hundred forty-five billion, six hundred fifty million, four hundred forty thousand, six hundred six".