66270981 has 48 divisors (see below), whose sum is σ = 113664384. Its totient is φ = 34062336.

The previous prime is 66270979. The next prime is 66271039. The reversal of 66270981 is 18907266.

It is not a de Polignac number, because 66270981 - 2¹ = 66270979 is a prime.

It is a super-2 number, since 2×66270981² = 8783685845404722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66270931) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56901 + ... + 58053.

It is an arithmetic number, because the mean of its divisors is an integer number (2368008).

Almost surely, 2^66270981 is an apocalyptic number.

It is an amenable number.

66270981 is a deficient number, since it is larger than the sum of its proper divisors (47393403).

66270981 is a wasteful number, since it uses less digits than its factorization.

66270981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 66270981 is about 8140.6990486076. The cubic root of 66270981 is about 404.6763272786.

The spelling of 66270981 in words is "sixty-six million, two hundred seventy thousand, nine hundred eighty-one".