65155610661 has 4 divisors (see below), whose sum is σ = 86874147552. Its totient is φ = 43437073772.

The previous prime is 65155610617. The next prime is 65155610669. The reversal of 65155610661 is 16601655156.

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.

It is a cyclic number.

It is not a de Polignac number, because 65155610661 - 2¹¹ = 65155608613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65155610669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10859268441 + ... + 10859268446.

It is an arithmetic number, because the mean of its divisors is an integer number (21718536888).

Almost surely, 2^65155610661 is an apocalyptic number.

It is an amenable number.

65155610661 is a deficient number, since it is larger than the sum of its proper divisors (21718536891).

65155610661 is a wasteful number, since it uses less digits than its factorization.

65155610661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21718536890.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 65155610661 in words is "sixty-five billion, one hundred fifty-five million, six hundred ten thousand, six hundred sixty-one".