621680927185 has 8 divisors (see below), whose sum is σ = 789900472296. Its totient is φ = 468089168640.

The previous prime is 621680927123. The next prime is 621680927209. The reversal of 621680927185 is 581729086126.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 304161074064 + 317519853121 = 551508^2 + 563489^2 .

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

It is not a de Polignac number, because 621680927185 - 2⁷ = 621680927057 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 3656946546 + ... + 3656946715.

It is an arithmetic number, because the mean of its divisors is an integer number (98737559037).

Almost surely, 2^621680927185 is an apocalyptic number.

It is an amenable number.

621680927185 is a deficient number, since it is larger than the sum of its proper divisors (168219545111).

621680927185 is a wasteful number, since it uses less digits than its factorization.

621680927185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313893283.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 621680927185 in words is "six hundred twenty-one billion, six hundred eighty million, nine hundred twenty-seven thousand, one hundred eighty-five".