55381671893 has 2 divisors, whose sum is σ = 55381671894. Its totient is φ = 55381671892.

The previous prime is 55381671881. The next prime is 55381671899. The reversal of 55381671893 is 39817618355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55157810449 + 223861444 = 234857^2 + 14962^2 .

It is a cyclic number.

It is not a de Polignac number, because 55381671893 - 2¹² = 55381667797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55381671899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27690835946 + 27690835947.

It is an arithmetic number, because the mean of its divisors is an integer number (27690835947).

Almost surely, 2^55381671893 is an apocalyptic number.

It is an amenable number.

55381671893 is a deficient number, since it is larger than the sum of its proper divisors (1).

55381671893 is an equidigital number, since it uses as much as digits as its factorization.

55381671893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 56.

The spelling of 55381671893 in words is "fifty-five billion, three hundred eighty-one million, six hundred seventy-one thousand, eight hundred ninety-three".