65998085 has 4 divisors (see below), whose sum is σ = 79197708. Its totient is φ = 52798464.

The previous prime is 65998081. The next prime is 65998099. The reversal of 65998085 is 58089956.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27384289 + 38613796 = 5233^2 + 6214^2 .

It is a cyclic number.

It is not a de Polignac number, because 65998085 - 2² = 65998081 is a prime.

It is a super-4 number, since 4×65998085⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65998081) 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, 6599804 + ... + 6599813.

It is an arithmetic number, because the mean of its divisors is an integer number (19799427).

Almost surely, 2^65998085 is an apocalyptic number.

It is an amenable number.

65998085 is a deficient number, since it is larger than the sum of its proper divisors (13199623).

65998085 is a wasteful number, since it uses less digits than its factorization.

65998085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13199622.

The product of its (nonzero) digits is 777600, while the sum is 50.

The square root of 65998085 is about 8123.9205436784. The cubic root of 65998085 is about 404.1200934514.

The spelling of 65998085 in words is "sixty-five million, nine hundred ninety-eight thousand, eighty-five".