55400087123 has 2 divisors, whose sum is σ = 55400087124. Its totient is φ = 55400087122.

The previous prime is 55400087077. The next prime is 55400087137. The reversal of 55400087123 is 32178000455.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55400087123 - 2⁶ = 55400087059 is a prime.

It is not a weakly prime, because it can be changed into another prime (55400087423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27700043561 + 27700043562.

It is an arithmetic number, because the mean of its divisors is an integer number (27700043562).

Almost surely, 2^55400087123 is an apocalyptic number.

55400087123 is a deficient number, since it is larger than the sum of its proper divisors (1).

55400087123 is an equidigital number, since it uses as much as digits as its factorization.

55400087123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 35.

Adding to 55400087123 its reverse (32178000455), we get a palindrome (87578087578).

The spelling of 55400087123 in words is "fifty-five billion, four hundred million, eighty-seven thousand, one hundred twenty-three".