691683585420 has 24 divisors (see below), whose sum is σ = 1936714039344. Its totient is φ = 184448956096.

The previous prime is 691683585419. The next prime is 691683585449. The reversal of 691683585420 is 24585386196.

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 7 ways as a sum of consecutive naturals, for example, 5764029819 + ... + 5764029938.

It is an arithmetic number, because the mean of its divisors is an integer number (80696418306).

Almost surely, 2^691683585420 is an apocalyptic number.

691683585420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691683585420 is an abundant number, since it is smaller than the sum of its proper divisors (1245030453924).

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

691683585420 is a wasteful number, since it uses less digits than its factorization.

691683585420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11528059769 (or 11528059767 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 57.

The spelling of 691683585420 in words is "six hundred ninety-one billion, six hundred eighty-three million, five hundred eighty-five thousand, four hundred twenty".