123551331040 has 48 divisors (see below), whose sum is σ = 293356879200. Its totient is φ = 49172175360.

The previous prime is 123551331037. The next prime is 123551331047. The reversal of 123551331040 is 40133155321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123551331047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1908351 + ... + 1972030.

It is an arithmetic number, because the mean of its divisors is an integer number (6111601650).

Almost surely, 2^123551331040 is an apocalyptic number.

123551331040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123551331040 is an abundant number, since it is smaller than the sum of its proper divisors (169805548160).

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

123551331040 is a wasteful number, since it uses less digits than its factorization.

123551331040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3880595 (or 3880587 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 123551331040 its reverse (40133155321), we get a palindrome (163684486361).

The spelling of 123551331040 in words is "one hundred twenty-three billion, five hundred fifty-one million, three hundred thirty-one thousand, forty".