645154065 has 64 divisors (see below), whose sum is σ = 1190246400. Its totient is φ = 335456640.

The previous prime is 645154049. The next prime is 645154073. The reversal of 645154065 is 560451546.

645154065 is a `hidden beast` number, since 6 + 4 + 51 + 540 + 65 = 666.

It is not a de Polignac number, because 645154065 - 2⁴ = 645154049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 447616 + ... + 449054.

It is an arithmetic number, because the mean of its divisors is an integer number (18597600).

Almost surely, 2^645154065 is an apocalyptic number.

It is an amenable number.

645154065 is a deficient number, since it is larger than the sum of its proper divisors (545092335).

645154065 is an equidigital number, since it uses as much as digits as its factorization.

645154065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 645154065 is about 25399.8831690226. The cubic root of 645154065 is about 864.0810470847.

It can be divided in two parts, 6451 and 54065, that added together give a square (60516 = 246²).

The spelling of 645154065 in words is "six hundred forty-five million, one hundred fifty-four thousand, sixty-five".