65711661 has 16 divisors (see below), whose sum is σ = 91004928. Its totient is φ = 42130800.

The previous prime is 65711641. The next prime is 65711669. The reversal of 65711661 is 16611756.

It is not a de Polignac number, because 65711661 - 2¹⁷ = 65580589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65711669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13416 + ... + 17646.

It is an arithmetic number, because the mean of its divisors is an integer number (5687808).

Almost surely, 2^65711661 is an apocalyptic number.

It is an amenable number.

65711661 is a deficient number, since it is larger than the sum of its proper divisors (25293267).

65711661 is a wasteful number, since it uses less digits than its factorization.

65711661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4432.

The product of its digits is 7560, while the sum is 33.

The square root of 65711661 is about 8106.2729413708. The cubic root of 65711661 is about 403.5346343164.

The spelling of 65711661 in words is "sixty-five million, seven hundred eleven thousand, six hundred sixty-one".