123355454351121 has 40 divisors (see below), whose sum is σ = 186936961669920. Its totient is φ = 81052255931328.

The previous prime is 123355454351083. The next prime is 123355454351131. The reversal of 123355454351121 is 121153454553321.

123355454351121 is a `hidden beast` number, since 1 + 2 + 3 + 3 + 5 + 54 + 543 + 51 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 123355454351121 - 2⁷ = 123355454350993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123355454351131) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19078380 + ... + 24712253.

It is an arithmetic number, because the mean of its divisors is an integer number (4673424041748).

Almost surely, 2^{123355454351121} is an apocalyptic number.

It is an amenable number.

123355454351121 is a deficient number, since it is larger than the sum of its proper divisors (63581507318799).

123355454351121 is an equidigital number, since it uses as much as digits as its factorization.

123355454351121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43791147 (or 43791138 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The spelling of 123355454351121 in words is "one hundred twenty-three trillion, three hundred fifty-five billion, four hundred fifty-four million, three hundred fifty-one thousand, one hundred twenty-one".