6334781561 has 4 divisors (see below), whose sum is σ = 6442150800. Its totient is φ = 6227412324.

The previous prime is 6334781549. The next prime is 6334781567. The reversal of 6334781561 is 1651874336.

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 6334781561 - 2¹⁸ = 6334519417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6334781567) 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 3 ways as a sum of consecutive naturals, for example, 53684531 + ... + 53684648.

It is an arithmetic number, because the mean of its divisors is an integer number (1610537700).

Almost surely, 2^6334781561 is an apocalyptic number.

It is an amenable number.

6334781561 is a deficient number, since it is larger than the sum of its proper divisors (107369239).

6334781561 is a wasteful number, since it uses less digits than its factorization.

6334781561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107369238.

The product of its digits is 362880, while the sum is 44.

The square root of 6334781561 is about 79591.3409925979. The cubic root of 6334781561 is about 1850.3073812115.

The spelling of 6334781561 in words is "six billion, three hundred thirty-four million, seven hundred eighty-one thousand, five hundred sixty-one".