6554718721 has 4 divisors (see below), whose sum is σ = 6573500500. Its totient is φ = 6535936944.

The previous prime is 6554718701. The next prime is 6554718761. The reversal of 6554718721 is 1278174556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3162937600 + 3391781121 = 56240^2 + 58239^2 .

It is a cyclic number.

It is not a de Polignac number, because 6554718721 - 2⁷ = 6554718593 is a prime.

It is a super-2 number, since 2×6554718721² = 85928675022855751682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6554718701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9390366 + ... + 9391063.

It is an arithmetic number, because the mean of its divisors is an integer number (1643375125).

Almost surely, 2^6554718721 is an apocalyptic number.

It is an amenable number.

6554718721 is a deficient number, since it is larger than the sum of its proper divisors (18781779).

6554718721 is a wasteful number, since it uses less digits than its factorization.

6554718721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18781778.

The product of its digits is 470400, while the sum is 46.

The square root of 6554718721 is about 80961.2173883274. The cubic root of 6554718721 is about 1871.4778294723.

The spelling of 6554718721 in words is "six billion, five hundred fifty-four million, seven hundred eighteen thousand, seven hundred twenty-one".