645548967 has 32 divisors (see below), whose sum is σ = 1094927360. Its totient is φ = 368232480.

The previous prime is 645548947. The next prime is 645548971. The reversal of 645548967 is 769845546.

645548967 is a `hidden beast` number, since 6 + 4 + 5 + 548 + 96 + 7 = 666.

It is not a de Polignac number, because 645548967 - 2⁸ = 645548711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645548947) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 116553 + ... + 121965.

It is an arithmetic number, because the mean of its divisors is an integer number (34216480).

Almost surely, 2^645548967 is an apocalyptic number.

645548967 is a deficient number, since it is larger than the sum of its proper divisors (449378393).

645548967 is a wasteful number, since it uses less digits than its factorization.

645548967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060 (or 6054 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 645548967 is about 25407.6556769805. The cubic root of 645548967 is about 864.2573138885.

The spelling of 645548967 in words is "six hundred forty-five million, five hundred forty-eight thousand, nine hundred sixty-seven".