681145623 has 12 divisors (see below), whose sum is σ = 986668800. Its totient is φ = 452808576.

The previous prime is 681145601. The next prime is 681145637. The reversal of 681145623 is 326541186.

It is a happy number.

681145623 is a `hidden beast` number, since 6 + 81 + 14 + 562 + 3 = 666.

681145623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-681145623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681145643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104023 + ... + 110376.

It is an arithmetic number, because the mean of its divisors is an integer number (82222400).

Almost surely, 2^681145623 is an apocalyptic number.

681145623 is a deficient number, since it is larger than the sum of its proper divisors (305523177).

681145623 is a wasteful number, since it uses less digits than its factorization.

681145623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214758 (or 214755 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 681145623 is about 26098.7666949992. The cubic root of 681145623 is about 879.8594915988.

It can be divided in two parts, 68114 and 5623, that added together give a palindrome (73737).

The spelling of 681145623 in words is "six hundred eighty-one million, one hundred forty-five thousand, six hundred twenty-three".