123203012155609 has 2 divisors, whose sum is σ = 123203012155610. Its totient is φ = 123203012155608.

The previous prime is 123203012155603. The next prime is 123203012155697. The reversal of 123203012155609 is 906551210302321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114969968984025 + 8233043171584 = 10722405^2 + 2869328^2 .

It is a cyclic number.

It is not a de Polignac number, because 123203012155609 - 2⁷ = 123203012155481 is a prime.

It is not a weakly prime, because it can be changed into another prime (123203012155603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61601506077804 + 61601506077805.

It is an arithmetic number, because the mean of its divisors is an integer number (61601506077805).

Almost surely, 2^{123203012155609} is an apocalyptic number.

It is an amenable number.

123203012155609 is a deficient number, since it is larger than the sum of its proper divisors (1).

123203012155609 is an equidigital number, since it uses as much as digits as its factorization.

123203012155609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 123203012155609 in words is "one hundred twenty-three trillion, two hundred three billion, twelve million, one hundred fifty-five thousand, six hundred nine".