55776613 has 2 divisors, whose sum is σ = 55776614. Its totient is φ = 55776612.

The previous prime is 55776601. The next prime is 55776619. The reversal of 55776613 is 31667755.

It is a happy number.

55776613 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., 55100929 + 675684 = 7423^2 + 822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55776613 is a prime.

It is a super-2 number, since 2×55776613² = 6222061115503538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55776619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27888306 + 27888307.

It is an arithmetic number, because the mean of its divisors is an integer number (27888307).

Almost surely, 2^55776613 is an apocalyptic number.

It is an amenable number.

55776613 is a deficient number, since it is larger than the sum of its proper divisors (1).

55776613 is an equidigital number, since it uses as much as digits as its factorization.

55776613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132300, while the sum is 40.

The square root of 55776613 is about 7468.3741871976. The cubic root of 55776613 is about 382.0768396179.

The spelling of 55776613 in words is "fifty-five million, seven hundred seventy-six thousand, six hundred thirteen".