65820115 has 4 divisors (see below), whose sum is σ = 78984144. Its totient is φ = 52656088.

The previous prime is 65820109. The next prime is 65820119. The reversal of 65820115 is 51102856.

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

It is a cyclic number.

It is not a de Polignac number, because 65820115 - 2²⁵ = 32265683 is a prime.

It is a super-2 number, since 2×65820115² = 8664575077226450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65820119) 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, 6582007 + ... + 6582016.

It is an arithmetic number, because the mean of its divisors is an integer number (19746036).

Almost surely, 2^65820115 is an apocalyptic number.

65820115 is a deficient number, since it is larger than the sum of its proper divisors (13164029).

65820115 is a wasteful number, since it uses less digits than its factorization.

65820115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13164028.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 65820115 is about 8112.9596942176. The cubic root of 65820115 is about 403.7565172581.

The spelling of 65820115 in words is "sixty-five million, eight hundred twenty thousand, one hundred fifteen".