681367032551 has 4 divisors (see below), whose sum is σ = 697985740704. Its totient is φ = 664748324400.

The previous prime is 681367032529. The next prime is 681367032557. The reversal of 681367032551 is 155230763186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681367032551 - 2⁶ = 681367032487 is a prime.

It is a super-2 number, since 2×681367032551² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681367032496 and 681367032505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681367032557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8309354015 + ... + 8309354096.

It is an arithmetic number, because the mean of its divisors is an integer number (174496435176).

Almost surely, 2^681367032551 is an apocalyptic number.

681367032551 is a deficient number, since it is larger than the sum of its proper divisors (16618708153).

681367032551 is a wasteful number, since it uses less digits than its factorization.

681367032551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16618708152.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 681367032551 in words is "six hundred eighty-one billion, three hundred sixty-seven million, thirty-two thousand, five hundred fifty-one".