681655736452 has 12 divisors (see below), whose sum is σ = 1255681619920. Its totient is φ = 322889559336.

The previous prime is 681655736393. The next prime is 681655736473. The reversal of 681655736452 is 254637556186.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4484577138 + ... + 4484577289.

Almost surely, 2^681655736452 is an apocalyptic number.

It is an amenable number.

681655736452 is a deficient number, since it is larger than the sum of its proper divisors (574025883468).

681655736452 is a wasteful number, since it uses less digits than its factorization.

681655736452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8969154450 (or 8969154448 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 58.

The spelling of 681655736452 in words is "six hundred eighty-one billion, six hundred fifty-five million, seven hundred thirty-six thousand, four hundred fifty-two".