6691354740 has 216 divisors, whose sum is σ = 23999917032. Its totient is φ = 1504258560.

The previous prime is 6691354739. The next prime is 6691354753. The reversal of 6691354740 is 474531966.

6691354740 is a `hidden beast` number, since 6 + 69 + 1 + 3 + 547 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 503015184 + 6188339556 = 22428^2 + 78666^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 531802 + ... + 544238.

It is an arithmetic number, because the mean of its divisors is an integer number (111110727).

Almost surely, 2^6691354740 is an apocalyptic number.

6691354740 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 6691354740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11999958516).

6691354740 is an abundant number, since it is smaller than the sum of its proper divisors (17308562292).

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

6691354740 is a wasteful number, since it uses less digits than its factorization.

6691354740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12527 (or 12515 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 6691354740 is about 81800.7013417367. The cubic root of 6691354740 is about 1884.3924324848.

The spelling of 6691354740 in words is "six billion, six hundred ninety-one million, three hundred fifty-four thousand, seven hundred forty".