123454661689 has 4 divisors (see below), whose sum is σ = 123455393424. Its totient is φ = 123453929956.

The previous prime is 123454661633. The next prime is 123454661711. The reversal of 123454661689 is 986166454321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 986166454321 = 151 ⋅6530903671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123454661689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123454661089) 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, 29934 + ... + 497800.

It is an arithmetic number, because the mean of its divisors is an integer number (30863848356).

Almost surely, 2^123454661689 is an apocalyptic number.

It is an amenable number.

123454661689 is a deficient number, since it is larger than the sum of its proper divisors (731735).

123454661689 is an equidigital number, since it uses as much as digits as its factorization.

123454661689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731734.

The product of its digits is 7464960, while the sum is 55.

The spelling of 123454661689 in words is "one hundred twenty-three billion, four hundred fifty-four million, six hundred sixty-one thousand, six hundred eighty-nine".