65805816 has 32 divisors (see below), whose sum is σ = 173174400. Its totient is φ = 20780640.

The previous prime is 65805811. The next prime is 65805823. The reversal of 65805816 is 61850856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65805811) 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, 71700 + ... + 72611.

It is an arithmetic number, because the mean of its divisors is an integer number (5411700).

Almost surely, 2^65805816 is an apocalyptic number.

It is an amenable number.

65805816 is an abundant number, since it is smaller than the sum of its proper divisors (107368584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65805816 is a wasteful number, since it uses less digits than its factorization.

65805816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144339 (or 144335 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 65805816 is about 8112.0784019880. The cubic root of 65805816 is about 403.7272772983.

The spelling of 65805816 in words is "sixty-five million, eight hundred five thousand, eight hundred sixteen".