123261045041550 has 144 divisors (see below), whose sum is σ = 332493555456720. Its totient is φ = 30040767744000.

The previous prime is 123261045041543. The next prime is 123261045041551. The reversal of 123261045041550 is 55140540162321.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 123261045041499 and 123261045041508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123261045041551) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16793686 + ... + 22990214.

It is an arithmetic number, because the mean of its divisors is an integer number (2308983024005).

Almost surely, 2^{123261045041550} is an apocalyptic number.

123261045041550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123261045041550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166246777728360).

123261045041550 is an abundant number, since it is smaller than the sum of its proper divisors (209232510415170).

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

123261045041550 is a wasteful number, since it uses less digits than its factorization.

123261045041550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196759 (or 6196653 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 123261045041550 in words is "one hundred twenty-three trillion, two hundred sixty-one billion, forty-five million, forty-one thousand, five hundred fifty".