645634316455 has 8 divisors (see below), whose sum is σ = 774765982800. Its totient is φ = 516504251136.

The previous prime is 645634316449. The next prime is 645634316471. The reversal of 645634316455 is 554613436546.

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 645634316455 - 2²¹ = 645632219303 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831576 + ... + 1408114.

It is an arithmetic number, because the mean of its divisors is an integer number (96845747850).

Almost surely, 2^645634316455 is an apocalyptic number.

645634316455 is a deficient number, since it is larger than the sum of its proper divisors (129131666345).

645634316455 is a wasteful number, since it uses less digits than its factorization.

645634316455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800513.

The product of its digits is 15552000, while the sum is 52.

The spelling of 645634316455 in words is "six hundred forty-five billion, six hundred thirty-four million, three hundred sixteen thousand, four hundred fifty-five".