55233493781 has 2 divisors, whose sum is σ = 55233493782. Its totient is φ = 55233493780.

The previous prime is 55233493751. The next prime is 55233493807. The reversal of 55233493781 is 18739433255.

55233493781 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 can be written as a sum of positive squares in only one way, i.e., 32721192100 + 22512301681 = 180890^2 + 150041^2 .

It is a cyclic number.

It is not a de Polignac number, because 55233493781 - 2¹⁰ = 55233492757 is a prime.

It is a super-2 number, since 2×55233493781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55233493751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27616746890 + 27616746891.

It is an arithmetic number, because the mean of its divisors is an integer number (27616746891).

Almost surely, 2^55233493781 is an apocalyptic number.

It is an amenable number.

55233493781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55233493781 is an equidigital number, since it uses as much as digits as its factorization.

55233493781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 50.

The spelling of 55233493781 in words is "fifty-five billion, two hundred thirty-three million, four hundred ninety-three thousand, seven hundred eighty-one".