691546117680 has 480 divisors, whose sum is σ = 2679128524800. Its totient is φ = 158280192000.

The previous prime is 691546117673. The next prime is 691546117793. The reversal of 691546117680 is 86711645196.

691546117680 is a `hidden beast` number, since 6 + 9 + 1 + 5 + 461 + 176 + 8 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10031971 + ... + 10100669.

It is an arithmetic number, because the mean of its divisors is an integer number (5581517760).

Almost surely, 2^691546117680 is an apocalyptic number.

691546117680 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 691546117680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339564262400).

691546117680 is an abundant number, since it is smaller than the sum of its proper divisors (1987582407120).

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

691546117680 is a wasteful number, since it uses less digits than its factorization.

691546117680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68801 (or 68792 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 691546117680 in words is "six hundred ninety-one billion, five hundred forty-six million, one hundred seventeen thousand, six hundred eighty".