6691706520 has 128 divisors (see below), whose sum is σ = 21341664000. Its totient is φ = 1673740800.

The previous prime is 6691706459. The next prime is 6691706543. The reversal of 6691706520 is 256071966.

It is a super-2 number, since 2×6691706520² = 89557872299621020800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215751 + ... + 244809.

It is an arithmetic number, because the mean of its divisors is an integer number (166731750).

Almost surely, 2^6691706520 is an apocalyptic number.

6691706520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6691706520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10670832000).

6691706520 is an abundant number, since it is smaller than the sum of its proper divisors (14649957480).

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

6691706520 is a wasteful number, since it uses less digits than its factorization.

6691706520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29193 (or 29189 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 6691706520 is about 81802.8515395399. The cubic root of 6691706520 is about 1884.4254541961.

The spelling of 6691706520 in words is "six billion, six hundred ninety-one million, seven hundred six thousand, five hundred twenty".