64165855 has 16 divisors (see below), whose sum is σ = 83359584. Its totient is φ = 47134080.

The previous prime is 64165853. The next prime is 64165921. The reversal of 64165855 is 55856146.

It is not a de Polignac number, because 64165855 - 2¹ = 64165853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64165853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10300 + ... + 15310.

It is an arithmetic number, because the mean of its divisors is an integer number (5209974).

Almost surely, 2^64165855 is an apocalyptic number.

64165855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64165855 is a deficient number, since it is larger than the sum of its proper divisors (19193729).

64165855 is a wasteful number, since it uses less digits than its factorization.

64165855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5226.

The product of its digits is 144000, while the sum is 40.

The square root of 64165855 is about 8010.3592303966. The cubic root of 64165855 is about 400.3452331994.

The spelling of 64165855 in words is "sixty-four million, one hundred sixty-five thousand, eight hundred fifty-five".