65198555 has 4 divisors (see below), whose sum is σ = 78238272. Its totient is φ = 52158840.

The previous prime is 65198531. The next prime is 65198561. The reversal of 65198555 is 55589156.

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

It is not a de Polignac number, because 65198555 - 2⁸ = 65198299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6519851 + ... + 6519860.

It is an arithmetic number, because the mean of its divisors is an integer number (19559568).

Almost surely, 2^65198555 is an apocalyptic number.

65198555 is a deficient number, since it is larger than the sum of its proper divisors (13039717).

65198555 is a wasteful number, since it uses less digits than its factorization.

65198555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13039716.

The product of its digits is 270000, while the sum is 44.

The square root of 65198555 is about 8074.5622172351. The cubic root of 65198555 is about 402.4815623667.

The spelling of 65198555 in words is "sixty-five million, one hundred ninety-eight thousand, five hundred fifty-five".