645118705 has 32 divisors (see below), whose sum is σ = 967080960. Its totient is φ = 401353920.

The previous prime is 645118699. The next prime is 645118751. The reversal of 645118705 is 507811546.

It is not a de Polignac number, because 645118705 - 2¹³ = 645110513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236962 + ... + 239668.

It is an arithmetic number, because the mean of its divisors is an integer number (30221280).

Almost surely, 2^645118705 is an apocalyptic number.

It is an amenable number.

645118705 is a deficient number, since it is larger than the sum of its proper divisors (321962255).

645118705 is a wasteful number, since it uses less digits than its factorization.

645118705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 645118705 is about 25399.1870932910. The cubic root of 645118705 is about 864.0652604348.

The spelling of 645118705 in words is "six hundred forty-five million, one hundred eighteen thousand, seven hundred five".