65936981 has 8 divisors (see below), whose sum is σ = 74412000. Its totient is φ = 57875440.

The previous prime is 65936963. The next prime is 65937029. The reversal of 65936981 is 18963956.

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 65936981 - 2¹⁰ = 65935957 is a prime.

It is a super-2 number, since 2×65936981² = 8695370926788722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65936281) 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, 103031 + ... + 103668.

It is an arithmetic number, because the mean of its divisors is an integer number (9301500).

Almost surely, 2^65936981 is an apocalyptic number.

It is an amenable number.

65936981 is a deficient number, since it is larger than the sum of its proper divisors (8475019).

65936981 is a wasteful number, since it uses less digits than its factorization.

65936981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206739.

The product of its digits is 349920, while the sum is 47.

The square root of 65936981 is about 8120.1589270161. The cubic root of 65936981 is about 403.9953374131.

The spelling of 65936981 in words is "sixty-five million, nine hundred thirty-six thousand, nine hundred eighty-one".