681378650571 has 8 divisors (see below), whose sum is σ = 908535841600. Its totient is φ = 454236946632.

The previous prime is 681378650567. The next prime is 681378650627. The reversal of 681378650571 is 175056873186.

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

It is not a de Polignac number, because 681378650571 - 2² = 681378650567 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681378650501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3768721 + ... + 3945378.

It is an arithmetic number, because the mean of its divisors is an integer number (113566980200).

Almost surely, 2^681378650571 is an apocalyptic number.

681378650571 is a deficient number, since it is larger than the sum of its proper divisors (227157191029).

681378650571 is a wasteful number, since it uses less digits than its factorization.

681378650571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7743545.

The product of its (nonzero) digits is 8467200, while the sum is 57.

The spelling of 681378650571 in words is "six hundred eighty-one billion, three hundred seventy-eight million, six hundred fifty thousand, five hundred seventy-one".