123437155540 has 24 divisors (see below), whose sum is σ = 259225021440. Its totient is φ = 49373529888.

The previous prime is 123437155529. The next prime is 123437155591. The reversal of 123437155540 is 45551734321.

It is a junction number, because it is equal to n+sod(n) for n = 123437155493 and 123437155502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057821 + ... + 1168699.

It is an arithmetic number, because the mean of its divisors is an integer number (10801042560).

Almost surely, 2^123437155540 is an apocalyptic number.

123437155540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123437155540 is an abundant number, since it is smaller than the sum of its proper divisors (135787865900).

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

123437155540 is a wasteful number, since it uses less digits than its factorization.

123437155540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166551 (or 166549 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

Adding to 123437155540 its reverse (45551734321), we get a palindrome (168988889861).

The spelling of 123437155540 in words is "one hundred twenty-three billion, four hundred thirty-seven million, one hundred fifty-five thousand, five hundred forty".