66549550 has 24 divisors (see below), whose sum is σ = 124322400. Its totient is φ = 26503680.

The previous prime is 66549547. The next prime is 66549589. The reversal of 66549550 is 5594566.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 9166 + ... + 14734.

It is an arithmetic number, because the mean of its divisors is an integer number (5180100).

Almost surely, 2^66549550 is an apocalyptic number.

66549550 is a deficient number, since it is larger than the sum of its proper divisors (57772850).

66549550 is a wasteful number, since it uses less digits than its factorization.

66549550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820 (or 5815 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 66549550 is about 8157.7907548551. The cubic root of 66549550 is about 405.2425514521.

The spelling of 66549550 in words is "sixty-six million, five hundred forty-nine thousand, five hundred fifty".