681116605 has 16 divisors (see below), whose sum is σ = 880758144. Its totient is φ = 502666560.

The previous prime is 681116599. The next prime is 681116633. The reversal of 681116605 is 506611186.

It is not a de Polignac number, because 681116605 - 2¹¹ = 681114557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191352 + ... + 194878.

It is an arithmetic number, because the mean of its divisors is an integer number (55047384).

Almost surely, 2^681116605 is an apocalyptic number.

681116605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

681116605 is a deficient number, since it is larger than the sum of its proper divisors (199641539).

681116605 is a wasteful number, since it uses less digits than its factorization.

681116605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 681116605 is about 26098.2107624258. The cubic root of 681116605 is about 879.8469969014.

The spelling of 681116605 in words is "six hundred eighty-one million, one hundred sixteen thousand, six hundred five".