645663416606 has 8 divisors (see below), whose sum is σ = 1042994749944. Its totient is φ = 297998499960.

The previous prime is 645663416581. The next prime is 645663416737. The reversal of 645663416606 is 606614366546.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12416604140 + ... + 12416604191.

It is an arithmetic number, because the mean of its divisors is an integer number (130374343743).

Almost surely, 2^645663416606 is an apocalyptic number.

645663416606 is a deficient number, since it is larger than the sum of its proper divisors (397331333338).

645663416606 is a wasteful number, since it uses less digits than its factorization.

645663416606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24833208346.

The product of its (nonzero) digits is 11197440, while the sum is 53.

The spelling of 645663416606 in words is "six hundred forty-five billion, six hundred sixty-three million, four hundred sixteen thousand, six hundred six".