681764457231 has 160 divisors (see below), whose sum is σ = 1206675283968. Its totient is φ = 378175599360.

The previous prime is 681764457193. The next prime is 681764457299. The reversal of 681764457231 is 132754467186.

681764457231 is a `hidden beast` number, since 6 + 8 + 1 + 7 + 64 + 4 + 572 + 3 + 1 = 666.

681764457231 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 681764457231 - 2⁶ = 681764457167 is a prime.

It is a super-2 number, since 2×681764457231² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (6773760) is a multiple of the sum of its prime factors (1323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681764457431) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1007037265 + ... + 1007037941.

Almost surely, 2^681764457231 is an apocalyptic number.

681764457231 is a deficient number, since it is larger than the sum of its proper divisors (524910826737).

681764457231 is a wasteful number, since it uses less digits than its factorization.

681764457231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1314 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 681764457231 in words is "six hundred eighty-one billion, seven hundred sixty-four million, four hundred fifty-seven thousand, two hundred thirty-one".