6691945380 has 48 divisors (see below), whose sum is σ = 19194465024. Its totient is φ = 1740993280.

The previous prime is 6691945303. The next prime is 6691945397. The reversal of 6691945380 is 835491966.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1357692 + ... + 1362611.

It is an arithmetic number, because the mean of its divisors is an integer number (399884688).

Almost surely, 2^6691945380 is an apocalyptic number.

6691945380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6691945380 is an abundant number, since it is smaller than the sum of its proper divisors (12502519644).

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

6691945380 is a wasteful number, since it uses less digits than its factorization.

6691945380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720356 (or 2720354 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 6691945380 is about 81804.3115000670. The cubic root of 6691945380 is about 1884.4478754080.

The spelling of 6691945380 in words is "six billion, six hundred ninety-one million, nine hundred forty-five thousand, three hundred eighty".