55123123403 has 2 divisors, whose sum is σ = 55123123404. Its totient is φ = 55123123402.

The previous prime is 55123123313. The next prime is 55123123409. The reversal of 55123123403 is 30432132155.

It is a happy number.

55123123403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55123123403 - 2¹² = 55123119307 is a prime.

It is not a weakly prime, because it can be changed into another prime (55123123409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27561561701 + 27561561702.

It is an arithmetic number, because the mean of its divisors is an integer number (27561561702).

Almost surely, 2^55123123403 is an apocalyptic number.

55123123403 is a deficient number, since it is larger than the sum of its proper divisors (1).

55123123403 is an equidigital number, since it uses as much as digits as its factorization.

55123123403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 55123123403 its reverse (30432132155), we get a palindrome (85555255558).

The spelling of 55123123403 in words is "fifty-five billion, one hundred twenty-three million, one hundred twenty-three thousand, four hundred three".