645244652105 has 8 divisors (see below), whose sum is σ = 776403376512. Its totient is φ = 514789192368.

The previous prime is 645244652051. The next prime is 645244652159. The reversal of 645244652105 is 501256442546.

It is an interprime number because it is at equal distance from previous prime (645244652051) and next prime (645244652159).

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 645244652105 - 2¹⁰ = 645244651081 is a prime.

It is a super-2 number, since 2×645244652105² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175814147 + ... + 175817816.

It is an arithmetic number, because the mean of its divisors is an integer number (97050422064).

Almost surely, 2^645244652105 is an apocalyptic number.

It is an amenable number.

645244652105 is a deficient number, since it is larger than the sum of its proper divisors (131158724407).

645244652105 is a wasteful number, since it uses less digits than its factorization.

645244652105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351632335.

The product of its (nonzero) digits is 1152000, while the sum is 44.

The spelling of 645244652105 in words is "six hundred forty-five billion, two hundred forty-four million, six hundred fifty-two thousand, one hundred five".