645742562171 has 8 divisors (see below), whose sum is σ = 738094155744. Its totient is φ = 553416632640.

The previous prime is 645742562167. The next prime is 645742562189. The reversal of 645742562171 is 171265247546.

It is a happy number.

645742562171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 645742562171 - 2² = 645742562167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645742562371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6362060 + ... + 6462761.

It is an arithmetic number, because the mean of its divisors is an integer number (92261769468).

Almost surely, 2^645742562171 is an apocalyptic number.

645742562171 is a deficient number, since it is larger than the sum of its proper divisors (92351593573).

645742562171 is a wasteful number, since it uses less digits than its factorization.

645742562171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12832021.

The product of its digits is 2822400, while the sum is 50.

The spelling of 645742562171 in words is "six hundred forty-five billion, seven hundred forty-two million, five hundred sixty-two thousand, one hundred seventy-one".