123546553540391 has 2 divisors, whose sum is σ = 123546553540392. Its totient is φ = 123546553540390.

The previous prime is 123546553540363. The next prime is 123546553540541. The reversal of 123546553540391 is 193045355645321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123546553540391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123546513540391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61773276770195 + 61773276770196.

It is an arithmetic number, because the mean of its divisors is an integer number (61773276770196).

Almost surely, 2^{123546553540391} is an apocalyptic number.

123546553540391 is a deficient number, since it is larger than the sum of its proper divisors (1).

123546553540391 is an equidigital number, since it uses as much as digits as its factorization.

123546553540391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160000, while the sum is 56.

The spelling of 123546553540391 in words is "one hundred twenty-three trillion, five hundred forty-six billion, five hundred fifty-three million, five hundred forty thousand, three hundred ninety-one".