65761661 has 12 divisors (see below), whose sum is σ = 79839648. Its totient is φ = 53049792.

The previous prime is 65761649. The next prime is 65761667. The reversal of 65761661 is 16616756.

It is not a de Polignac number, because 65761661 - 2¹⁰ = 65760637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65761667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14231 + ... + 18276.

It is an arithmetic number, because the mean of its divisors is an integer number (6653304).

Almost surely, 2^65761661 is an apocalyptic number.

It is an amenable number.

65761661 is a deficient number, since it is larger than the sum of its proper divisors (14077987).

65761661 is a wasteful number, since it uses less digits than its factorization.

65761661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32548 (or 32531 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 65761661 is about 8109.3563862985. The cubic root of 65761661 is about 403.6369581966.

The spelling of 65761661 in words is "sixty-five million, seven hundred sixty-one thousand, six hundred sixty-one".