123215696789 has 4 divisors (see below), whose sum is σ = 123744519756. Its totient is φ = 122686873824.

The previous prime is 123215696767. The next prime is 123215696809. The reversal of 123215696789 is 987696512321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987696512321 = 37 ⋅26694500333.

It can be written as a sum of positive squares in 2 ways, for example, as 45212792689 + 78002904100 = 212633^2 + 279290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123215696789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123215696089) 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, 264411134 + ... + 264411599.

It is an arithmetic number, because the mean of its divisors is an integer number (30936129939).

Almost surely, 2^123215696789 is an apocalyptic number.

It is an amenable number.

123215696789 is a deficient number, since it is larger than the sum of its proper divisors (528822967).

123215696789 is an equidigital number, since it uses as much as digits as its factorization.

123215696789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528822966.

The product of its digits is 9797760, while the sum is 59.

The spelling of 123215696789 in words is "one hundred twenty-three billion, two hundred fifteen million, six hundred ninety-six thousand, seven hundred eighty-nine".