645415040265 has 16 divisors (see below), whose sum is σ = 1044267033600. Its totient is φ = 340353698432.

The previous prime is 645415040243. The next prime is 645415040297. The reversal of 645415040265 is 562040514546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645415040265 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241727145 + ... + 241729814.

It is an arithmetic number, because the mean of its divisors is an integer number (65266689600).

Almost surely, 2^645415040265 is an apocalyptic number.

It is an amenable number.

645415040265 is a deficient number, since it is larger than the sum of its proper divisors (398851993335).

645415040265 is a wasteful number, since it uses less digits than its factorization.

645415040265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483457056.

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 645415040265 in words is "six hundred forty-five billion, four hundred fifteen million, forty thousand, two hundred sixty-five".