123912163865 has 16 divisors (see below), whose sum is σ = 178880718720. Its totient is φ = 80496322560.

The previous prime is 123912163829. The next prime is 123912163891. The reversal of 123912163865 is 568361219321.

It is not a de Polignac number, because 123912163865 - 2²² = 123907969561 is a prime.

It is a super-2 number, since 2×123912163865² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93166376 + ... + 93167705.

It is an arithmetic number, because the mean of its divisors is an integer number (11180044920).

Almost surely, 2^123912163865 is an apocalyptic number.

It is an amenable number.

123912163865 is a deficient number, since it is larger than the sum of its proper divisors (54968554855).

123912163865 is a wasteful number, since it uses less digits than its factorization.

123912163865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186334112.

The product of its digits is 466560, while the sum is 47.

The spelling of 123912163865 in words is "one hundred twenty-three billion, nine hundred twelve million, one hundred sixty-three thousand, eight hundred sixty-five".