55722166 has 16 divisors (see below), whose sum is σ = 88309440. Its totient is φ = 26326720.

The previous prime is 55722131. The next prime is 55722167. The reversal of 55722166 is 66122755.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55722167) by changing a digit.

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, 7495 + ... + 12946.

It is an arithmetic number, because the mean of its divisors is an integer number (5519340).

Almost surely, 2^55722166 is an apocalyptic number.

55722166 is a deficient number, since it is larger than the sum of its proper divisors (32587274).

55722166 is a wasteful number, since it uses less digits than its factorization.

55722166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20519.

The product of its digits is 25200, while the sum is 34.

The square root of 55722166 is about 7464.7281263285. The cubic root of 55722166 is about 381.9524762019.

It can be divided in two parts, 5 and 5722166, that multiplied together give a triangular number (28610830 = T₇₅₆₄).

The spelling of 55722166 in words is "fifty-five million, seven hundred twenty-two thousand, one hundred sixty-six".