65650981 has 8 divisors (see below), whose sum is σ = 73285344. Its totient is φ = 58294320.

The previous prime is 65650979. The next prime is 65651063. The reversal of 65650981 is 18905656.

65650981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65650981 - 2¹ = 65650979 is a prime.

It is a super-2 number, since 2×65650981² = 8620102612524722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65650181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68926 + ... + 69871.

It is an arithmetic number, because the mean of its divisors is an integer number (9160668).

Almost surely, 2^65650981 is an apocalyptic number.

It is an amenable number.

65650981 is a deficient number, since it is larger than the sum of its proper divisors (7634363).

65650981 is a wasteful number, since it uses less digits than its factorization.

65650981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138851.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 65650981 is about 8102.5292964605. The cubic root of 65650981 is about 403.4103843112.

The spelling of 65650981 in words is "sixty-five million, six hundred fifty thousand, nine hundred eighty-one".