645650616406 has 8 divisors (see below), whose sum is σ = 986749055424. Its totient is φ = 316734264600.

The previous prime is 645650616293. The next prime is 645650616407. The reversal of 645650616406 is 604616056546.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 645650616406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645650616407) 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, 3045521670 + ... + 3045521881.

It is an arithmetic number, because the mean of its divisors is an integer number (123343631928).

Almost surely, 2^645650616406 is an apocalyptic number.

645650616406 is a deficient number, since it is larger than the sum of its proper divisors (341098439018).

645650616406 is a wasteful number, since it uses less digits than its factorization.

645650616406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091043606.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 645650616406 in words is "six hundred forty-five billion, six hundred fifty million, six hundred sixteen thousand, four hundred six".