123909955680 has 192 divisors, whose sum is σ = 446693280768. Its totient is φ = 28283074560.

The previous prime is 123909955679. The next prime is 123909955703. The reversal of 123909955680 is 86559909321.

It is a self number, because there is not a number n which added to its sum of digits gives 123909955680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2437725 + ... + 2488035.

It is an arithmetic number, because the mean of its divisors is an integer number (2326527504).

Almost surely, 2^123909955680 is an apocalyptic number.

123909955680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123909955680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223346640384).

123909955680 is an abundant number, since it is smaller than the sum of its proper divisors (322783325088).

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

123909955680 is a wasteful number, since it uses less digits than its factorization.

123909955680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51069 (or 51061 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 57.

The spelling of 123909955680 in words is "one hundred twenty-three billion, nine hundred nine million, nine hundred fifty-five thousand, six hundred eighty".