123551203512 has 128 divisors (see below), whose sum is σ = 348965625600. Its totient is φ = 36108441600.

The previous prime is 123551203493. The next prime is 123551203547. The reversal of 123551203512 is 215302155321.

It is a super-2 number, since 2×123551203512² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123551203512.

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, 7241712 + ... + 7258752.

It is an arithmetic number, because the mean of its divisors is an integer number (2726293950).

Almost surely, 2^123551203512 is an apocalyptic number.

123551203512 is a gapful number since it is divisible by the number (12) 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 123551203512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174482812800).

123551203512 is an abundant number, since it is smaller than the sum of its proper divisors (225414422088).

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

123551203512 is a wasteful number, since it uses less digits than its factorization.

123551203512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18037 (or 18033 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 123551203512 its reverse (215302155321), we get a palindrome (338853358833).

The spelling of 123551203512 in words is "one hundred twenty-three billion, five hundred fifty-one million, two hundred three thousand, five hundred twelve".