65312337661 has 4 divisors (see below), whose sum is σ = 66207027292. Its totient is φ = 64417648032.

The previous prime is 65312337647. The next prime is 65312337703. The reversal of 65312337661 is 16673321356.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15357405625 + 49954932036 = 123925^2 + 223506^2 .

It is a cyclic number.

It is not a de Polignac number, because 65312337661 - 2⁹ = 65312337149 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 (65312337611) 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, 447344706 + ... + 447344851.

It is an arithmetic number, because the mean of its divisors is an integer number (16551756823).

Almost surely, 2^65312337661 is an apocalyptic number.

It is an amenable number.

65312337661 is a deficient number, since it is larger than the sum of its proper divisors (894689631).

65312337661 is an equidigital number, since it uses as much as digits as its factorization.

65312337661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894689630.

The product of its digits is 408240, while the sum is 43.

The spelling of 65312337661 in words is "sixty-five billion, three hundred twelve million, three hundred thirty-seven thousand, six hundred sixty-one".