681650188 has 6 divisors (see below), whose sum is σ = 1192887836. Its totient is φ = 340825092.

The previous prime is 681650183. The next prime is 681650201. The reversal of 681650188 is 881056186.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (681650183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85206270 + ... + 85206277.

Almost surely, 2^681650188 is an apocalyptic number.

It is an amenable number.

681650188 is a deficient number, since it is larger than the sum of its proper divisors (511237648).

681650188 is a wasteful number, since it uses less digits than its factorization.

681650188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170412551 (or 170412549 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 681650188 is about 26108.4313584712. The cubic root of 681650188 is about 880.0766926961.

The spelling of 681650188 in words is "six hundred eighty-one million, six hundred fifty thousand, one hundred eighty-eight".