66061988 has 12 divisors (see below), whose sum is σ = 118428492. Its totient is φ = 32225280.

The previous prime is 66061987. The next prime is 66061999. The reversal of 66061988 is 88916066.

It can be written as a sum of positive squares in 2 ways, for example, as 19166884 + 46895104 = 4378^2 + 6848^2 .

It is not an unprimeable number, because it can be changed into a prime (66061987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201245 + ... + 201572.

It is an arithmetic number, because the mean of its divisors is an integer number (9869041).

Almost surely, 2^66061988 is an apocalyptic number.

It is an amenable number.

66061988 is a deficient number, since it is larger than the sum of its proper divisors (52366504).

66061988 is a wasteful number, since it uses less digits than its factorization.

66061988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402862 (or 402860 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 66061988 is about 8127.8526069313. The cubic root of 66061988 is about 404.2504818604.

The spelling of 66061988 in words is "sixty-six million, sixty-one thousand, nine hundred eighty-eight".