65555557 has 8 divisors (see below), whose sum is σ = 66090816. Its totient is φ = 65022912.

The previous prime is 65555537. The next prime is 65555603. The reversal of 65555557 is 75555556.

65555557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65555557 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 (65555537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110253 + ... + 110845.

It is an arithmetic number, because the mean of its divisors is an integer number (8261352).

Almost surely, 2^65555557 is an apocalyptic number.

It is an amenable number.

65555557 is a deficient number, since it is larger than the sum of its proper divisors (535259).

65555557 is a wasteful number, since it uses less digits than its factorization.

65555557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307.

The product of its digits is 656250, while the sum is 43.

The square root of 65555557 is about 8096.6386235277. The cubic root of 65555557 is about 403.2148365936.

Subtracting 65555557 from its reverse (75555556), we obtain a palindrome (9999999).

The spelling of 65555557 in words is "sixty-five million, five hundred fifty-five thousand, five hundred fifty-seven".