645111107 has 8 divisors (see below), whose sum is σ = 674205984. Its totient is φ = 616103488.

The previous prime is 645111083. The next prime is 645111127. The reversal of 645111107 is 701111546.

It is a happy number.

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 645111107 - 2¹⁰ = 645110083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645111127) 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, 6458 + ... + 36495.

It is an arithmetic number, because the mean of its divisors is an integer number (84275748).

Almost surely, 2^645111107 is an apocalyptic number.

645111107 is a deficient number, since it is larger than the sum of its proper divisors (29094877).

645111107 is a wasteful number, since it uses less digits than its factorization.

645111107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43629.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 645111107 is about 25399.0375211345. The cubic root of 645111107 is about 864.0618681942.

The spelling of 645111107 in words is "six hundred forty-five million, one hundred eleven thousand, one hundred seven".