6781508145 has 48 divisors (see below), whose sum is σ = 11890973952. Its totient is φ = 3574972800.

The previous prime is 6781508143. The next prime is 6781508159. The reversal of 6781508145 is 5418051876.

6781508145 is a `hidden beast` number, since 67 + 81 + 508 + 1 + 4 + 5 = 666.

It is not a de Polignac number, because 6781508145 - 2¹ = 6781508143 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6781508145.

It is not an unprimeable number, because it can be changed into a prime (6781508143) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4394244 + ... + 4395786.

It is an arithmetic number, because the mean of its divisors is an integer number (247728624).

Almost surely, 2^6781508145 is an apocalyptic number.

It is an amenable number.

6781508145 is a deficient number, since it is larger than the sum of its proper divisors (5109465807).

6781508145 is a wasteful number, since it uses less digits than its factorization.

6781508145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622 (or 2619 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 6781508145 is about 82349.9128414839. The cubic root of 6781508145 is about 1892.8175871942.

The spelling of 6781508145 in words is "six billion, seven hundred eighty-one million, five hundred eight thousand, one hundred forty-five".