65736881 has 12 divisors (see below), whose sum is σ = 79108020. Its totient is φ = 54401760.

The previous prime is 65736877. The next prime is 65736883. The reversal of 65736881 is 18863756.

65736881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 55368481 + 10368400 = 7441^2 + 3220^2 .

It is not a de Polignac number, because 65736881 - 2² = 65736877 is a prime.

It is a super-2 number, since 2×65736881² = 8642675047216322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65736883) 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 11 ways as a sum of consecutive naturals, for example, 21710 + ... + 24551.

It is an arithmetic number, because the mean of its divisors is an integer number (6592335).

Almost surely, 2^65736881 is an apocalyptic number.

It is an amenable number.

65736881 is a deficient number, since it is larger than the sum of its proper divisors (13371139).

65736881 is a wasteful number, since it uses less digits than its factorization.

65736881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46304 (or 46297 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 65736881 is about 8107.8283775620. The cubic root of 65736881 is about 403.5862529667.

The spelling of 65736881 in words is "sixty-five million, seven hundred thirty-six thousand, eight hundred eighty-one".