681722267087 has 18 divisors (see below), whose sum is σ = 718519307688. Its totient is φ = 645586458528.

The previous prime is 681722267071. The next prime is 681722267101. The reversal of 681722267087 is 780762227186.

It is not a de Polignac number, because 681722267087 - 2⁴ = 681722267071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681722267027) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 423692339 + ... + 423693947.

It is an arithmetic number, because the mean of its divisors is an integer number (39917739316).

Almost surely, 2^681722267087 is an apocalyptic number.

681722267087 is a deficient number, since it is larger than the sum of its proper divisors (36797040601).

681722267087 is an frugal number, since it uses more digits than its factorization.

681722267087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455 (or 1739 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 56.

The spelling of 681722267087 in words is "six hundred eighty-one billion, seven hundred twenty-two million, two hundred sixty-seven thousand, eighty-seven".