123607865849 has 4 divisors (see below), whose sum is σ = 133116163236. Its totient is φ = 114099568464.

The previous prime is 123607865839. The next prime is 123607865863. The reversal of 123607865849 is 948568706321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27321775849 + 96286090000 = 165293^2 + 310300^2 .

It is a cyclic number.

It is not a de Polignac number, because 123607865849 - 2²⁰ = 123606817273 is a prime.

It is a super-3 number, since 3×123607865849³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123607865809) 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, 4754148674 + ... + 4754148699.

It is an arithmetic number, because the mean of its divisors is an integer number (33279040809).

It is a 1-persistent number, because it is pandigital, but 2⋅123607865849 = 247215731698 is not.

Almost surely, 2^123607865849 is an apocalyptic number.

It is an amenable number.

123607865849 is a deficient number, since it is larger than the sum of its proper divisors (9508297387).

123607865849 is an equidigital number, since it uses as much as digits as its factorization.

123607865849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9508297386.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 123607865849 in words is "one hundred twenty-three billion, six hundred seven million, eight hundred sixty-five thousand, eight hundred forty-nine".