691620859598 has 8 divisors (see below), whose sum is σ = 1039248158520. Its totient is φ = 345204806760.

The previous prime is 691620859571. The next prime is 691620859621. The reversal of 691620859598 is 895958026196.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 302810093 + ... + 302812376.

It is an arithmetic number, because the mean of its divisors is an integer number (129906019815).

Almost surely, 2^691620859598 is an apocalyptic number.

691620859598 is a deficient number, since it is larger than the sum of its proper divisors (347627298922).

691620859598 is a wasteful number, since it uses less digits than its factorization.

691620859598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605623042.

The product of its (nonzero) digits is 83980800, while the sum is 68.

The spelling of 691620859598 in words is "six hundred ninety-one billion, six hundred twenty million, eight hundred fifty-nine thousand, five hundred ninety-eight".