66655090 has 16 divisors (see below), whose sum is σ = 120099672. Its totient is φ = 26635264.

The previous prime is 66655067. The next prime is 66655091. The reversal of 66655090 is 9055666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 64786401 + 1868689 = 8049^2 + 1367^2 .

It is not an unprimeable number, because it can be changed into a prime (66655091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9432 + ... + 14908.

Almost surely, 2^66655090 is an apocalyptic number.

66655090 is a deficient number, since it is larger than the sum of its proper divisors (53444582).

66655090 is a wasteful number, since it uses less digits than its factorization.

66655090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6701.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 66655090 is about 8164.2568553421. The cubic root of 66655090 is about 405.4566611378.

The spelling of 66655090 in words is "sixty-six million, six hundred fifty-five thousand, ninety".