6601221705 has 16 divisors (see below), whose sum is σ = 11374413120. Its totient is φ = 3249832128.

The previous prime is 6601221691. The next prime is 6601221707. The reversal of 6601221705 is 5071221066.

It is not a de Polignac number, because 6601221705 - 2¹¹ = 6601219657 is a prime.

It is a super-2 number, since 2×6601221705² = 87152255997126214050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6601221707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16926015 + ... + 16926404.

It is an arithmetic number, because the mean of its divisors is an integer number (710900820).

Almost surely, 2^6601221705 is an apocalyptic number.

6601221705 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6601221705 is a deficient number, since it is larger than the sum of its proper divisors (4773191415).

6601221705 is a wasteful number, since it uses less digits than its factorization.

6601221705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33852440.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 6601221705 is about 81247.9027729332. The cubic root of 6601221705 is about 1875.8931879584.

The spelling of 6601221705 in words is "six billion, six hundred one million, two hundred twenty-one thousand, seven hundred five".