681870506636 has 48 divisors (see below), whose sum is σ = 1305869160960. Its totient is φ = 308962600320.

The previous prime is 681870506587. The next prime is 681870506659. The reversal of 681870506636 is 636605078186.

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 15 ways as a sum of consecutive naturals, for example, 18182441 + ... + 18219903.

It is an arithmetic number, because the mean of its divisors is an integer number (27205607520).

Almost surely, 2^681870506636 is an apocalyptic number.

It is an amenable number.

681870506636 is a deficient number, since it is larger than the sum of its proper divisors (623998654324).

681870506636 is a wasteful number, since it uses less digits than its factorization.

681870506636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38774 (or 38772 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 681870506636 in words is "six hundred eighty-one billion, eight hundred seventy million, five hundred six thousand, six hundred thirty-six".