6781564323 has 16 divisors (see below), whose sum is σ = 10060610560. Its totient is φ = 4514811048.

The previous prime is 6781564319. The next prime is 6781564331. The reversal of 6781564323 is 3234651876.

6781564323 is a `hidden beast` number, since 6 + 7 + 81 + 564 + 3 + 2 + 3 = 666.

It is not a de Polignac number, because 6781564323 - 2² = 6781564319 is a prime.

It is a super-2 number, since 2×6781564323² = 91979229333972896658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6781514323) 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 15 ways as a sum of consecutive naturals, for example, 153115 + ... + 192372.

It is an arithmetic number, because the mean of its divisors is an integer number (628788160).

Almost surely, 2^6781564323 is an apocalyptic number.

6781564323 is a deficient number, since it is larger than the sum of its proper divisors (3279046237).

6781564323 is a wasteful number, since it uses less digits than its factorization.

6781564323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346223 (or 346217 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 6781564323 is about 82350.2539340347. The cubic root of 6781564323 is about 1892.8228138788.

It can be divided in two parts, 678 and 1564323, that added together give a square (1565001 = 1251²).

The spelling of 6781564323 in words is "six billion, seven hundred eighty-one million, five hundred sixty-four thousand, three hundred twenty-three".