123659916989 has 16 divisors (see below), whose sum is σ = 144976664448. Its totient is φ = 103268354112.

The previous prime is 123659916983. The next prime is 123659916997. The reversal of 123659916989 is 989619956321.

It is a de Polignac number, because none of the positive numbers 2^k-123659916989 is a prime.

It is a super-2 number, since 2×123659916989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123659916983) 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, 397922 + ... + 636915.

It is an arithmetic number, because the mean of its divisors is an integer number (9061041528).

Almost surely, 2^123659916989 is an apocalyptic number.

It is an amenable number.

123659916989 is a deficient number, since it is larger than the sum of its proper divisors (21316747459).

123659916989 is a wasteful number, since it uses less digits than its factorization.

123659916989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035284.

The product of its digits is 56687040, while the sum is 68.

The spelling of 123659916989 in words is "one hundred twenty-three billion, six hundred fifty-nine million, nine hundred sixteen thousand, nine hundred eighty-nine".