64205851 has 4 divisors (see below), whose sum is σ = 64696104. Its totient is φ = 63715600.

The previous prime is 64205839. The next prime is 64205861. The reversal of 64205851 is 15850246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15850246 = 2 ⋅7925123.

It is a cyclic number.

It is not a de Polignac number, because 64205851 - 2⁵ = 64205819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64205861) 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, 244930 + ... + 245191.

It is an arithmetic number, because the mean of its divisors is an integer number (16174026).

Almost surely, 2^64205851 is an apocalyptic number.

64205851 is a deficient number, since it is larger than the sum of its proper divisors (490253).

64205851 is a wasteful number, since it uses less digits than its factorization.

64205851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490252.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 64205851 is about 8012.8553587345. The cubic root of 64205851 is about 400.4283972756.

It can be divided in two parts, 64205 and 851, that added together give a palindrome (65056).

The spelling of 64205851 in words is "sixty-four million, two hundred five thousand, eight hundred fifty-one".