6620251766 has 16 divisors (see below), whose sum is σ = 9971249904. Its totient is φ = 3296520864.

The previous prime is 6620251753. The next prime is 6620251769. The reversal of 6620251766 is 6671520266.

It is a super-2 number, since 2×6620251766² = 87655466890452237512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620251769) 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, 839096 + ... + 846948.

It is an arithmetic number, because the mean of its divisors is an integer number (623203119).

Almost surely, 2^6620251766 is an apocalyptic number.

6620251766 is a deficient number, since it is larger than the sum of its proper divisors (3350998138).

6620251766 is a wasteful number, since it uses less digits than its factorization.

6620251766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9535.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 6620251766 is about 81364.9295827140. The cubic root of 6620251766 is about 1877.6940724195.

The spelling of 6620251766 in words is "six billion, six hundred twenty million, two hundred fifty-one thousand, seven hundred sixty-six".