65736981 has 32 divisors (see below), whose sum is σ = 102157440. Its totient is φ = 41731200.

The previous prime is 65736947. The next prime is 65736991. The reversal of 65736981 is 18963756.

It is a happy number.

65736981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65736981 - 2⁹ = 65736469 is a prime.

It is a super-2 number, since 2×65736981² = 8642701341988722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65736991) 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 31 ways as a sum of consecutive naturals, for example, 46911 + ... + 48291.

It is an arithmetic number, because the mean of its divisors is an integer number (3192420).

Almost surely, 2^65736981 is an apocalyptic number.

It is an amenable number.

65736981 is a deficient number, since it is larger than the sum of its proper divisors (36420459).

65736981 is a wasteful number, since it uses less digits than its factorization.

65736981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1468 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 65736981 is about 8107.8345444391. The cubic root of 65736981 is about 403.5864576139.

The spelling of 65736981 in words is "sixty-five million, seven hundred thirty-six thousand, nine hundred eighty-one".