681660512877 has 8 divisors (see below), whose sum is σ = 910666306080. Its totient is φ = 453547530800.

The previous prime is 681660512837. The next prime is 681660512891. The reversal of 681660512877 is 778215066186.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681660512877 - 2¹⁰ = 681660511853 is a prime.

It is a super-2 number, since 2×681660512877² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681660512837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223200999 + ... + 223204052.

It is an arithmetic number, because the mean of its divisors is an integer number (113833288260).

Almost surely, 2^681660512877 is an apocalyptic number.

It is an amenable number.

681660512877 is a deficient number, since it is larger than the sum of its proper divisors (229005793203).

681660512877 is a wasteful number, since it uses less digits than its factorization.

681660512877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446405563.

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 681660512877 in words is "six hundred eighty-one billion, six hundred sixty million, five hundred twelve thousand, eight hundred seventy-seven".