65998667 has 8 divisors (see below), whose sum is σ = 76095456. Its totient is φ = 56068992.

The previous prime is 65998663. The next prime is 65998687. The reversal of 65998667 is 76689956.

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

It is not a de Polignac number, because 65998667 - 2² = 65998663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65998663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 40928 + ... + 42509.

It is an arithmetic number, because the mean of its divisors is an integer number (9511932).

Almost surely, 2^65998667 is an apocalyptic number.

65998667 is a deficient number, since it is larger than the sum of its proper divisors (10096789).

65998667 is a wasteful number, since it uses less digits than its factorization.

65998667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83557.

The product of its digits is 4898880, while the sum is 56.

The square root of 65998667 is about 8123.9563637430. The cubic root of 65998667 is about 404.1212813505.

The spelling of 65998667 in words is "sixty-five million, nine hundred ninety-eight thousand, six hundred sixty-seven".