123545551342417 has 2 divisors, whose sum is σ = 123545551342418. Its totient is φ = 123545551342416.

The previous prime is 123545551342361. The next prime is 123545551342427. The reversal of 123545551342417 is 714243155545321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98759252697361 + 24786298645056 = 9937769^2 + 4978584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123545551342417 is a prime.

It is not a weakly prime, because it can be changed into another prime (123545551342427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61772775671208 + 61772775671209.

It is an arithmetic number, because the mean of its divisors is an integer number (61772775671209).

Almost surely, 2^{123545551342417} is an apocalyptic number.

It is an amenable number.

123545551342417 is a deficient number, since it is larger than the sum of its proper divisors (1).

123545551342417 is an equidigital number, since it uses as much as digits as its factorization.

123545551342417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080000, while the sum is 52.

The spelling of 123545551342417 in words is "one hundred twenty-three trillion, five hundred forty-five billion, five hundred fifty-one million, three hundred forty-two thousand, four hundred seventeen".