6669988900 has 27 divisors (see below), whose sum is σ = 14475648369. Its totient is φ = 2667668880.

The previous prime is 6669988859. The next prime is 6669988907. The reversal of 6669988900 is 98899666.

The square root of 6669988900 is 81670.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2401196004 + 4268792896 = 49002^2 + 65336^2 .

It is a super-2 number, since 2×6669988900² = 88977503852246420000, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6669988907) 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 8 ways as a sum of consecutive naturals, for example, 812617 + ... + 820783.

Almost surely, 2^6669988900 is an apocalyptic number.

6669988900 is the 81670-th square number.

It is an amenable number.

6669988900 is an abundant number, since it is smaller than the sum of its proper divisors (7805659469).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6669988900 is an frugal number, since it uses more digits than its factorization.

6669988900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16348 (or 8174 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 61.

The cubic root of 6669988900 is about 1882.3846399706.

The spelling of 6669988900 in words is "six billion, six hundred sixty-nine million, nine hundred eighty-eight thousand, nine hundred".