681037966581 has 16 divisors (see below), whose sum is σ = 1040386187904. Its totient is φ = 388184284224.

The previous prime is 681037966561. The next prime is 681037966589. The reversal of 681037966581 is 185669730186.

681037966581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681037966581 - 2¹⁰ = 681037965557 is a prime.

It is a super-2 number, since 2×681037966581² (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 (681037966589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40835970 + ... + 40852643.

It is an arithmetic number, because the mean of its divisors is an integer number (65024136744).

Almost surely, 2^681037966581 is an apocalyptic number.

It is an amenable number.

681037966581 is a deficient number, since it is larger than the sum of its proper divisors (359348221323).

681037966581 is a wasteful number, since it uses less digits than its factorization.

681037966581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81689020.

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 681037966581 in words is "six hundred eighty-one billion, thirty-seven million, nine hundred sixty-six thousand, five hundred eighty-one".