123405555541501 has 4 divisors (see below), whose sum is σ = 128771014478112. Its totient is φ = 118040096604892.

The previous prime is 123405555541459. The next prime is 123405555541529. The reversal of 123405555541501 is 105145555504321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123405555541501 - 2²⁷ = 123405421323773 is a prime.

It is a super-2 number, since 2×123405555541501² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123405555541561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2682729468271 + ... + 2682729468316.

It is an arithmetic number, because the mean of its divisors is an integer number (32192753619528).

Almost surely, 2^{123405555541501} is an apocalyptic number.

It is an amenable number.

123405555541501 is a deficient number, since it is larger than the sum of its proper divisors (5365458936611).

123405555541501 is an equidigital number, since it uses as much as digits as its factorization.

123405555541501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365458936610.

The product of its (nonzero) digits is 1500000, while the sum is 46.

The spelling of 123405555541501 in words is "one hundred twenty-three trillion, four hundred five billion, five hundred fifty-five million, five hundred forty-one thousand, five hundred one".