681966123 has 8 divisors (see below), whose sum is σ = 948822528. Its totient is φ = 434876904.

The previous prime is 681966091. The next prime is 681966143. The reversal of 681966123 is 321669186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681966123 - 2⁵ = 681966091 is a prime.

It is a super-2 number, since 2×681966123² = 930155585839302258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681966143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4941715 + ... + 4941852.

It is an arithmetic number, because the mean of its divisors is an integer number (118602816).

Almost surely, 2^681966123 is an apocalyptic number.

681966123 is a deficient number, since it is larger than the sum of its proper divisors (266856405).

681966123 is a wasteful number, since it uses less digits than its factorization.

681966123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9883593.

The product of its digits is 93312, while the sum is 42.

The square root of 681966123 is about 26114.4810976592. The cubic root of 681966123 is about 880.2126392999.

The spelling of 681966123 in words is "six hundred eighty-one million, nine hundred sixty-six thousand, one hundred twenty-three".