55451219909 has 2 divisors, whose sum is σ = 55451219910. Its totient is φ = 55451219908.

The previous prime is 55451219891. The next prime is 55451219927. The reversal of 55451219909 is 90991215455.

It is a balanced prime because it is at equal distance from previous prime (55451219891) and next prime (55451219927).

It can be written as a sum of positive squares in only one way, i.e., 32464111684 + 22987108225 = 180178^2 + 151615^2 .

It is a cyclic number.

It is not a de Polignac number, because 55451219909 - 2²⁰ = 55450171333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55451215909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27725609954 + 27725609955.

It is an arithmetic number, because the mean of its divisors is an integer number (27725609955).

Almost surely, 2^55451219909 is an apocalyptic number.

It is an amenable number.

55451219909 is a deficient number, since it is larger than the sum of its proper divisors (1).

55451219909 is an equidigital number, since it uses as much as digits as its factorization.

55451219909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729000, while the sum is 50.

The spelling of 55451219909 in words is "fifty-five billion, four hundred fifty-one million, two hundred nineteen thousand, nine hundred nine".