123017513872 has 80 divisors (see below), whose sum is σ = 264908491200. Its totient is φ = 54868037120.

The previous prime is 123017513803. The next prime is 123017513881. The reversal of 123017513872 is 278315710321.

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, 5773254 + ... + 5794522.

It is an arithmetic number, because the mean of its divisors is an integer number (3311356140).

Almost surely, 2^123017513872 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 123017513872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132454245600).

123017513872 is an abundant number, since it is smaller than the sum of its proper divisors (141890977328).

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

123017513872 is a wasteful number, since it uses less digits than its factorization.

123017513872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21904 (or 21898 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 123017513872 in words is "one hundred twenty-three billion, seventeen million, five hundred thirteen thousand, eight hundred seventy-two".