66995556 has 24 divisors (see below), whose sum is σ = 156582720. Its totient is φ = 22294752.

The previous prime is 66995519. The next prime is 66995561. The reversal of 66995556 is 65559966.

It is a junction number, because it is equal to n+sod(n) for n = 66995499 and 66995508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3450 + ... + 12078.

It is an arithmetic number, because the mean of its divisors is an integer number (6524280).

Almost surely, 2^66995556 is an apocalyptic number.

It is an amenable number.

66995556 is an abundant number, since it is smaller than the sum of its proper divisors (89587164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66995556 is a wasteful number, since it uses less digits than its factorization.

66995556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283 (or 9281 counting only the distinct ones).

The product of its digits is 2187000, while the sum is 51.

The square root of 66995556 is about 8185.0813068656. The cubic root of 66995556 is about 406.1458299854.

The spelling of 66995556 in words is "sixty-six million, nine hundred ninety-five thousand, five hundred fifty-six".