65061661 has 6 divisors (see below), whose sum is σ = 75684030. Its totient is φ = 55767096.

The previous prime is 65061637. The next prime is 65061679. The reversal of 65061661 is 16616056.

65061661 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 only one way, i.e., 62900761 + 2160900 = 7931^2 + 1470^2 .

It is not a de Polignac number, because 65061661 - 2¹⁷ = 64930589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65061611) 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 5 ways as a sum of consecutive naturals, for example, 663846 + ... + 663943.

It is an arithmetic number, because the mean of its divisors is an integer number (12614005).

Almost surely, 2^65061661 is an apocalyptic number.

It is an amenable number.

65061661 is a deficient number, since it is larger than the sum of its proper divisors (10622369).

65061661 is a wasteful number, since it uses less digits than its factorization.

65061661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327803 (or 1327796 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 65061661 is about 8066.0808947096. The cubic root of 65061661 is about 402.1996751496.

The spelling of 65061661 in words is "sixty-five million, sixty-one thousand, six hundred sixty-one".