66549290 has 16 divisors (see below), whose sum is σ = 119884968. Its totient is φ = 26598336.

The previous prime is 66549289. The next prime is 66549293. The reversal of 66549290 is 9294566.

It can be written as a sum of positive squares in 4 ways, for example, as 61669609 + 4879681 = 7853^2 + 2209^2 .

It is not an unprimeable number, because it can be changed into a prime (66549293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18044 + ... + 21416.

Almost surely, 2^66549290 is an apocalyptic number.

66549290 is a deficient number, since it is larger than the sum of its proper divisors (53335678).

66549290 is a wasteful number, since it uses less digits than its factorization.

66549290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 66549290 is about 8157.7748191526. The cubic root of 66549290 is about 405.2420237090.

The spelling of 66549290 in words is "sixty-six million, five hundred forty-nine thousand, two hundred ninety".