6921180660 has 24 divisors (see below), whose sum is σ = 19379306016. Its totient is φ = 1845648160.

The previous prime is 6921180613. The next prime is 6921180671. The reversal of 6921180660 is 660811296.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57676446 + ... + 57676565.

It is an arithmetic number, because the mean of its divisors is an integer number (807471084).

Almost surely, 2^6921180660 is an apocalyptic number.

6921180660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6921180660 is an abundant number, since it is smaller than the sum of its proper divisors (12458125356).

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

6921180660 is a wasteful number, since it uses less digits than its factorization.

6921180660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115353023 (or 115353021 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 6921180660 is about 83193.6335304571. The cubic root of 6921180660 is about 1905.7242566832.

The spelling of 6921180660 in words is "six billion, nine hundred twenty-one million, one hundred eighty thousand, six hundred sixty".