123209255680 has 288 divisors, whose sum is σ = 352915928064. Its totient is φ = 40295743488.

The previous prime is 123209255599. The next prime is 123209255699. The reversal of 123209255680 is 86552902321.

It is a super-2 number, since 2×123209255680² (a number of 23 digits) contains 22 as substring.

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, 112725214 + ... + 112726306.

It is an arithmetic number, because the mean of its divisors is an integer number (1225402528).

Almost surely, 2^123209255680 is an apocalyptic number.

123209255680 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 123209255680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176457964032).

123209255680 is an abundant number, since it is smaller than the sum of its proper divisors (229706672384).

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

123209255680 is a wasteful number, since it uses less digits than its factorization.

123209255680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 123209255680 in words is "one hundred twenty-three billion, two hundred nine million, two hundred fifty-five thousand, six hundred eighty".