65881215 has 16 divisors (see below), whose sum is σ = 117122400. Its totient is φ = 35136576.

The previous prime is 65881213. The next prime is 65881217. The reversal of 65881215 is 51218856.

It is an interprime number because it is at equal distance from previous prime (65881213) and next prime (65881217).

It is not a de Polignac number, because 65881215 - 2¹ = 65881213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65881215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65881213) 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 15 ways as a sum of consecutive naturals, for example, 243870 + ... + 244139.

It is an arithmetic number, because the mean of its divisors is an integer number (7320150).

Almost surely, 2^65881215 is an apocalyptic number.

65881215 is a deficient number, since it is larger than the sum of its proper divisors (51241185).

65881215 is a wasteful number, since it uses less digits than its factorization.

65881215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488023 (or 488017 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 65881215 is about 8116.7244008898. The cubic root of 65881215 is about 403.8814126829.

The spelling of 65881215 in words is "sixty-five million, eight hundred eighty-one thousand, two hundred fifteen".