123051511817808 has 640 divisors, whose sum is σ = 393985564262400. Its totient is φ = 32318122991616.

The previous prime is 123051511817803. The next prime is 123051511817849. The reversal of 123051511817808 is 808718115150321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123051511817803) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7878314223 + ... + 7878329841.

It is an arithmetic number, because the mean of its divisors is an integer number (615602444160).

Almost surely, 2^{123051511817808} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123051511817808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196992782131200).

123051511817808 is an abundant number, since it is smaller than the sum of its proper divisors (270934052444592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123051511817808 is a wasteful number, since it uses less digits than its factorization.

123051511817808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15999 (or 15993 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 51.

The spelling of 123051511817808 in words is "one hundred twenty-three trillion, fifty-one billion, five hundred eleven million, eight hundred seventeen thousand, eight hundred eight".