55381266 has 16 divisors (see below), whose sum is σ = 123069600. Its totient is φ = 18460404.

The previous prime is 55381253. The next prime is 55381297. The reversal of 55381266 is 66218355.

55381266 is a `hidden beast` number, since 553 + 81 + 26 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 55381266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512736 + ... + 512843.

It is an arithmetic number, because the mean of its divisors is an integer number (7691850).

Almost surely, 2^55381266 is an apocalyptic number.

55381266 is an abundant number, since it is smaller than the sum of its proper divisors (67688334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55381266 is a wasteful number, since it uses less digits than its factorization.

55381266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025590 (or 1025584 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 55381266 is about 7441.8590419330. The cubic root of 55381266 is about 381.1719727088.

It can be divided in two parts, 553812 and 66, that added together give a triangular number (553878 = T₁₀₅₂).

The spelling of 55381266 in words is "fifty-five million, three hundred eighty-one thousand, two hundred sixty-six".