123553205551 has 2 divisors, whose sum is σ = 123553205552. Its totient is φ = 123553205550.

The previous prime is 123553205519. The next prime is 123553205561. The reversal of 123553205551 is 155502355321.

It is a strong prime.

It is an emirp because it is prime and its reverse (155502355321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123553205551 - 2⁵ = 123553205519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123553205551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123553205561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61776602775 + 61776602776.

It is an arithmetic number, because the mean of its divisors is an integer number (61776602776).

Almost surely, 2^123553205551 is an apocalyptic number.

123553205551 is a deficient number, since it is larger than the sum of its proper divisors (1).

123553205551 is an equidigital number, since it uses as much as digits as its factorization.

123553205551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112500, while the sum is 37.

The spelling of 123553205551 in words is "one hundred twenty-three billion, five hundred fifty-three million, two hundred five thousand, five hundred fifty-one".