65691061 has 8 divisors (see below), whose sum is σ = 69615000. Its totient is φ = 61877760.

The previous prime is 65691053. The next prime is 65691071. The reversal of 65691061 is 16019656.

It can be written as a sum of positive squares in 4 ways, for example, as 3186225 + 62504836 = 1785^2 + 7906^2 .

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 65691061 - 2³ = 65691053 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 (65691071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26436 + ... + 28813.

It is an arithmetic number, because the mean of its divisors is an integer number (8701875).

Almost surely, 2^65691061 is an apocalyptic number.

It is an amenable number.

65691061 is a deficient number, since it is larger than the sum of its proper divisors (3923939).

65691061 is a wasteful number, since it uses less digits than its factorization.

65691061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55319.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 65691061 is about 8105.0022208510. The cubic root of 65691061 is about 403.4924617798.

The spelling of 65691061 in words is "sixty-five million, six hundred ninety-one thousand, sixty-one".