6507878561 has 4 divisors (see below), whose sum is σ = 6571061952. Its totient is φ = 6444695172.

The previous prime is 6507878557. The next prime is 6507878591. The reversal of 6507878561 is 1658787056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6507878561 - 2² = 6507878557 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6507878521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31591541 + ... + 31591746.

It is an arithmetic number, because the mean of its divisors is an integer number (1642765488).

Almost surely, 2^6507878561 is an apocalyptic number.

It is an amenable number.

6507878561 is a deficient number, since it is larger than the sum of its proper divisors (63183391).

6507878561 is a wasteful number, since it uses less digits than its factorization.

6507878561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63183390.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The square root of 6507878561 is about 80671.4234472158. The cubic root of 6507878561 is about 1867.0092949119.

The spelling of 6507878561 in words is "six billion, five hundred seven million, eight hundred seventy-eight thousand, five hundred sixty-one".