65105081 has 4 divisors (see below), whose sum is σ = 65121252. Its totient is φ = 65088912.

The previous prime is 65105069. The next prime is 65105101. The reversal of 65105081 is 18050156.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 59151481 + 5953600 = 7691^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 65105081 - 2¹⁴ = 65088697 is a prime.

It is a super-2 number, since 2×65105081² = 8477343144033122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65105081.

It is not an unprimeable number, because it can be changed into a prime (65105981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3275 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (16280313).

Almost surely, 2^65105081 is an apocalyptic number.

It is an amenable number.

65105081 is a deficient number, since it is larger than the sum of its proper divisors (16171).

65105081 is an equidigital number, since it uses as much as digits as its factorization.

65105081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16170.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 65105081 is about 8068.7719635642. The cubic root of 65105081 is about 402.2891268390.

The spelling of 65105081 in words is "sixty-five million, one hundred five thousand, eighty-one".