55555255649 has 2 divisors, whose sum is σ = 55555255650. Its totient is φ = 55555255648.

The previous prime is 55555255531. The next prime is 55555255681. The reversal of 55555255649 is 94655255555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29629425424 + 25925830225 = 172132^2 + 161015^2 .

It is a cyclic number.

It is not a de Polignac number, because 55555255649 - 2²⁰ = 55554207073 is a prime.

It is a super-2 number, since 2×55555255649² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55555255594 and 55555255603.

It is not a weakly prime, because it can be changed into another prime (55555251649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777627824 + 27777627825.

It is an arithmetic number, because the mean of its divisors is an integer number (27777627825).

Almost surely, 2^55555255649 is an apocalyptic number.

It is an amenable number.

55555255649 is a deficient number, since it is larger than the sum of its proper divisors (1).

55555255649 is an equidigital number, since it uses as much as digits as its factorization.

55555255649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33750000, while the sum is 56.

The spelling of 55555255649 in words is "fifty-five billion, five hundred fifty-five million, two hundred fifty-five thousand, six hundred forty-nine".