681884155 has 8 divisors (see below), whose sum is σ = 828619200. Its totient is φ = 538601856.

The previous prime is 681884123. The next prime is 681884191. The reversal of 681884155 is 551488186.

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

It is a cyclic number.

It is not a de Polignac number, because 681884155 - 2⁵ = 681884123 is a prime.

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, 862750 + ... + 863539.

It is an arithmetic number, because the mean of its divisors is an integer number (103577400).

Almost surely, 2^681884155 is an apocalyptic number.

681884155 is a deficient number, since it is larger than the sum of its proper divisors (146735045).

681884155 is a wasteful number, since it uses less digits than its factorization.

681884155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726373.

The product of its digits is 307200, while the sum is 46.

The square root of 681884155 is about 26112.9116530501. The cubic root of 681884155 is about 880.1773725625.

The spelling of 681884155 in words is "six hundred eighty-one million, eight hundred eighty-four thousand, one hundred fifty-five".