6345516781 has 8 divisors (see below), whose sum is σ = 6752548800. Its totient is φ = 5942236608.

The previous prime is 6345516733. The next prime is 6345516787. The reversal of 6345516781 is 1876155436.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6345516781 - 2¹¹ = 6345514733 is a prime.

It is a super-2 number, since 2×6345516781² = 80531166435905203922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6345516787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 934471 + ... + 941236.

It is an arithmetic number, because the mean of its divisors is an integer number (844068600).

Almost surely, 2^6345516781 is an apocalyptic number.

It is an amenable number.

6345516781 is a deficient number, since it is larger than the sum of its proper divisors (407032019).

6345516781 is a wasteful number, since it uses less digits than its factorization.

6345516781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875923.

The product of its digits is 604800, while the sum is 46.

The square root of 6345516781 is about 79658.7520678048. The cubic root of 6345516781 is about 1851.3519974385.

The spelling of 6345516781 in words is "six billion, three hundred forty-five million, five hundred sixteen thousand, seven hundred eighty-one".