65998091 has 8 divisors (see below), whose sum is σ = 67535424. Its totient is φ = 64471680.

The previous prime is 65998081. The next prime is 65998099. The reversal of 65998091 is 19089956.

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

It is a cyclic number.

It is not a de Polignac number, because 65998091 - 2¹⁰ = 65997067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65998099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10190 + ... + 15356.

It is an arithmetic number, because the mean of its divisors is an integer number (8441928).

Almost surely, 2^65998091 is an apocalyptic number.

65998091 is a deficient number, since it is larger than the sum of its proper divisors (1537333).

65998091 is a wasteful number, since it uses less digits than its factorization.

65998091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5461.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 65998091 is about 8123.9209129582. The cubic root of 65998091 is about 404.1201056978.

The spelling of 65998091 in words is "sixty-five million, nine hundred ninety-eight thousand, ninety-one".