681665622 has 32 divisors (see below), whose sum is σ = 1565550720. Its totient is φ = 195693120.

The previous prime is 681665599. The next prime is 681665629. The reversal of 681665622 is 226566186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681665629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270543 + ... + 273050.

It is an arithmetic number, because the mean of its divisors is an integer number (48923460).

Almost surely, 2^681665622 is an apocalyptic number.

681665622 is an abundant number, since it is smaller than the sum of its proper divisors (883885098).

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

681665622 is a wasteful number, since it uses less digits than its factorization.

681665622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543628.

The product of its digits is 207360, while the sum is 42.

The square root of 681665622 is about 26108.7269318134. The cubic root of 681665622 is about 880.0833349111.

The spelling of 681665622 in words is "six hundred eighty-one million, six hundred sixty-five thousand, six hundred twenty-two".