691617616 has 40 divisors (see below), whose sum is σ = 1387212800. Its totient is φ = 333777024.

The previous prime is 691617571. The next prime is 691617629. The reversal of 691617616 is 616716196.

691617616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70585 + ... + 79783.

It is an arithmetic number, because the mean of its divisors is an integer number (34680320).

Almost surely, 2^691617616 is an apocalyptic number.

It is an amenable number.

691617616 is an abundant number, since it is smaller than the sum of its proper divisors (695595184).

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

691617616 is a wasteful number, since it uses less digits than its factorization.

691617616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9371 (or 9365 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 691617616 is about 26298.6238423230. The cubic root of 691617616 is about 884.3455921681.

The spelling of 691617616 in words is "six hundred ninety-one million, six hundred seventeen thousand, six hundred sixteen".