6658722271 has 4 divisors (see below), whose sum is σ = 6709552344. Its totient is φ = 6607892200.

The previous prime is 6658722253. The next prime is 6658722319. The reversal of 6658722271 is 1722278566.

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

It is a cyclic number.

It is not a de Polignac number, because 6658722271 - 2²⁵ = 6625167839 is a prime.

It is a super-2 number, since 2×6658722271² = 88677164564622794882, 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 (6658722211) 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, 25414840 + ... + 25415101.

It is an arithmetic number, because the mean of its divisors is an integer number (1677388086).

Almost surely, 2^6658722271 is an apocalyptic number.

6658722271 is a deficient number, since it is larger than the sum of its proper divisors (50830073).

6658722271 is a wasteful number, since it uses less digits than its factorization.

6658722271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50830072.

The product of its digits is 564480, while the sum is 46.

The square root of 6658722271 is about 81600.9943015402. The cubic root of 6658722271 is about 1881.3241643503.

The spelling of 6658722271 in words is "six billion, six hundred fifty-eight million, seven hundred twenty-two thousand, two hundred seventy-one".