66582821090 has 16 divisors (see below), whose sum is σ = 120511230840. Its totient is φ = 26485983360.

The previous prime is 66582821023. The next prime is 66582821093. The reversal of 66582821090 is 9012828566.

It can be written as a sum of positive squares in 4 ways, for example, as 27622772401 + 38960048689 = 166201^2 + 197383^2 .

It is not an unprimeable number, because it can be changed into a prime (66582821093) 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, 18391235 + ... + 18394854.

Almost surely, 2^66582821090 is an apocalyptic number.

66582821090 is a deficient number, since it is larger than the sum of its proper divisors (53928409750).

66582821090 is a wasteful number, since it uses less digits than its factorization.

66582821090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36786277.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 66582821090 in words is "sixty-six billion, five hundred eighty-two million, eight hundred twenty-one thousand, ninety".