691080698880 has 1760 divisors, whose sum is σ = 2988032560128. Its totient is φ = 150493593600.

The previous prime is 691080698863. The next prime is 691080698921. The reversal of 691080698880 is 88896080196.

It is a tau number, because it is divible by the number of its divisors (1760).

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 159 ways as a sum of consecutive naturals, for example, 2550113145 + ... + 2550113415.

Almost surely, 2^691080698880 is an apocalyptic number.

691080698880 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 691080698880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494016280064).

691080698880 is an abundant number, since it is smaller than the sum of its proper divisors (2296951861248).

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

691080698880 is a wasteful number, since it uses less digits than its factorization.

691080698880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 63.

The spelling of 691080698880 in words is "six hundred ninety-one billion, eighty million, six hundred ninety-eight thousand, eight hundred eighty".