65657161 has 4 divisors (see below), whose sum is σ = 65907072. Its totient is φ = 65407252.

The previous prime is 65657159. The next prime is 65657177. The reversal of 65657161 is 16175656.

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 65657161 - 2¹ = 65657159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65657161.

It is not an unprimeable number, because it can be changed into a prime (65657561) 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, 124561 + ... + 125086.

It is an arithmetic number, because the mean of its divisors is an integer number (16476768).

Almost surely, 2^65657161 is an apocalyptic number.

It is an amenable number.

65657161 is a deficient number, since it is larger than the sum of its proper divisors (249911).

65657161 is a wasteful number, since it uses less digits than its factorization.

65657161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249910.

The product of its digits is 37800, while the sum is 37.

The square root of 65657161 is about 8102.9106498838. The cubic root of 65657161 is about 403.4230421467.

The spelling of 65657161 in words is "sixty-five million, six hundred fifty-seven thousand, one hundred sixty-one".