65212661 has 4 divisors (see below), whose sum is σ = 65229024. Its totient is φ = 65196300.

The previous prime is 65212649. The next prime is 65212687. The reversal of 65212661 is 16621256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 65212661 - 2²² = 61018357 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 (65212601) 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, 2126 + ... + 11616.

It is an arithmetic number, because the mean of its divisors is an integer number (16307256).

Almost surely, 2^65212661 is an apocalyptic number.

It is an amenable number.

65212661 is a deficient number, since it is larger than the sum of its proper divisors (16363).

65212661 is an equidigital number, since it uses as much as digits as its factorization.

65212661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16362.

The product of its digits is 4320, while the sum is 29.

The square root of 65212661 is about 8075.4356538827. The cubic root of 65212661 is about 402.5105865045.

The spelling of 65212661 in words is "sixty-five million, two hundred twelve thousand, six hundred sixty-one".