6451016561 has 8 divisors (see below), whose sum is σ = 7042216800. Its totient is φ = 5860607040.

The previous prime is 6451016557. The next prime is 6451016581. The reversal of 6451016561 is 1656101546.

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 6451016561 - 2² = 6451016557 is a prime.

It is a super-2 number, since 2×6451016561² = 83231229340592533442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6451016521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180551 + ... + 213308.

It is an arithmetic number, because the mean of its divisors is an integer number (880277100).

Almost surely, 2^6451016561 is an apocalyptic number.

It is an amenable number.

6451016561 is a deficient number, since it is larger than the sum of its proper divisors (591200239).

6451016561 is a wasteful number, since it uses less digits than its factorization.

6451016561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395359.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 6451016561 is about 80318.2206040448. The cubic root of 6451016561 is about 1861.5557724637. Note that the first 3 decimals are identical.

The spelling of 6451016561 in words is "six billion, four hundred fifty-one million, sixteen thousand, five hundred sixty-one".