681065012 has 12 divisors (see below), whose sum is σ = 1202412036. Its totient is φ = 337518720.

The previous prime is 681064997. The next prime is 681065017. The reversal of 681065012 is 210560186.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 256128016 + 424936996 = 16004^2 + 20614^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681065017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752939 + ... + 753842.

It is an arithmetic number, because the mean of its divisors is an integer number (100201003).

Almost surely, 2^681065012 is an apocalyptic number.

It is an amenable number.

681065012 is a deficient number, since it is larger than the sum of its proper divisors (521347024).

681065012 is a wasteful number, since it uses less digits than its factorization.

681065012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506898 (or 1506896 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 681065012 is about 26097.2223042990. Note that the first 3 decimals coincide. The cubic root of 681065012 is about 879.8247808853.

The spelling of 681065012 in words is "six hundred eighty-one million, sixty-five thousand, twelve".