123403721575 has 12 divisors (see below), whose sum is σ = 154957587040. Its totient is φ = 97473317760.

The previous prime is 123403721561. The next prime is 123403721579. The reversal of 123403721575 is 575127304321.

It is a happy number.

It is not a de Polignac number, because 123403721575 - 2¹⁹ = 123403197287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123403721579) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31239474 + ... + 31243423.

Almost surely, 2^123403721575 is an apocalyptic number.

123403721575 is a deficient number, since it is larger than the sum of its proper divisors (31553865465).

123403721575 is an equidigital number, since it uses as much as digits as its factorization.

123403721575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62482986 (or 62482981 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The spelling of 123403721575 in words is "one hundred twenty-three billion, four hundred three million, seven hundred twenty-one thousand, five hundred seventy-five".