65557823 has 4 divisors (see below), whose sum is σ = 65627568. Its totient is φ = 65488080.

The previous prime is 65557769. The next prime is 65557837. The reversal of 65557823 is 32875556.

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

It is a cyclic number.

It is not a de Polignac number, because 65557823 - 2⁶ = 65557759 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 (65557883) 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, 33443 + ... + 35348.

It is an arithmetic number, because the mean of its divisors is an integer number (16406892).

Almost surely, 2^65557823 is an apocalyptic number.

65557823 is a deficient number, since it is larger than the sum of its proper divisors (69745).

65557823 is an equidigital number, since it uses as much as digits as its factorization.

65557823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69744.

The product of its digits is 252000, while the sum is 41.

The square root of 65557823 is about 8096.7785569324. The cubic root of 65557823 is about 403.2194823950.

The spelling of 65557823 in words is "sixty-five million, five hundred fifty-seven thousand, eight hundred twenty-three".