65442215 has 4 divisors (see below), whose sum is σ = 78530664. Its totient is φ = 52353768.

The previous prime is 65442187. The next prime is 65442239. The reversal of 65442215 is 51224456.

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 65442215 - 2¹⁴ = 65425831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6544217 + ... + 6544226.

It is an arithmetic number, because the mean of its divisors is an integer number (19632666).

Almost surely, 2^65442215 is an apocalyptic number.

65442215 is a deficient number, since it is larger than the sum of its proper divisors (13088449).

65442215 is a wasteful number, since it uses less digits than its factorization.

65442215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13088448.

The product of its digits is 9600, while the sum is 29.

The square root of 65442215 is about 8089.6362711806. The cubic root of 65442215 is about 402.9823236854.

The spelling of 65442215 in words is "sixty-five million, four hundred forty-two thousand, two hundred fifteen".