681366650 has 24 divisors (see below), whose sum is σ = 1269277020. Its totient is φ = 272130560.

The previous prime is 681366643. The next prime is 681366667. The reversal of 681366650 is 56663186.

681366650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 604225561 + 77141089 = 24581^2 + 8783^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 681366598 and 681366607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23786 + ... + 43914.

Almost surely, 2^681366650 is an apocalyptic number.

681366650 is a deficient number, since it is larger than the sum of its proper divisors (587910370).

681366650 is a wasteful number, since it uses less digits than its factorization.

681366650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20818 (or 20813 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 681366650 is about 26103.0007853503. Note that the first 3 decimals coincide. The cubic root of 681366650 is about 879.9546507278.

Subtracting from 681366650 its sum of digits (41), we obtain a square (681366609 = 26103²).

The spelling of 681366650 in words is "six hundred eighty-one million, three hundred sixty-six thousand, six hundred fifty".