123555152515321 has 2 divisors, whose sum is σ = 123555152515322. Its totient is φ = 123555152515320.

The previous prime is 123555152515271. The next prime is 123555152515363. The reversal of 123555152515321 is 123515251555321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112228831503721 + 11326321011600 = 10593811^2 + 3365460^2 .

It is a cyclic number.

It is not a de Polignac number, because 123555152515321 - 2²⁹ = 123554615644409 is a prime.

It is not a weakly prime, because it can be changed into another prime (123555152512321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61777576257660 + 61777576257661.

It is an arithmetic number, because the mean of its divisors is an integer number (61777576257661).

Almost surely, 2^{123555152515321} is an apocalyptic number.

It is an amenable number.

123555152515321 is a deficient number, since it is larger than the sum of its proper divisors (1).

123555152515321 is an equidigital number, since it uses as much as digits as its factorization.

123555152515321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1125000, while the sum is 46.

The spelling of 123555152515321 in words is "one hundred twenty-three trillion, five hundred fifty-five billion, one hundred fifty-two million, five hundred fifteen thousand, three hundred twenty-one".