681680066 has 16 divisors (see below), whose sum is σ = 1030968000. Its totient is φ = 338031408.

The previous prime is 681680009. The next prime is 681680089. The reversal of 681680066 is 660086186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254651 + ... + 257313.

It is an arithmetic number, because the mean of its divisors is an integer number (64435500).

Almost surely, 2^681680066 is an apocalyptic number.

681680066 is a deficient number, since it is larger than the sum of its proper divisors (349287934).

681680066 is a wasteful number, since it uses less digits than its factorization.

681680066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 681680066 is about 26109.0035428394. The cubic root of 681680066 is about 880.0895509763.

The spelling of 681680066 in words is "six hundred eighty-one million, six hundred eighty thousand, sixty-six".