65642851 has 4 divisors (see below), whose sum is σ = 68496912. Its totient is φ = 62788792.

The previous prime is 65642809. The next prime is 65642867. The reversal of 65642851 is 15824656.

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 65642851 - 2⁷ = 65642723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65642851.

It is not an unprimeable number, because it can be changed into a prime (65642881) 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, 1426996 + ... + 1427041.

It is an arithmetic number, because the mean of its divisors is an integer number (17124228).

Almost surely, 2^65642851 is an apocalyptic number.

65642851 is a deficient number, since it is larger than the sum of its proper divisors (2854061).

65642851 is a wasteful number, since it uses less digits than its factorization.

65642851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854060.

The product of its digits is 57600, while the sum is 37.

The square root of 65642851 is about 8102.0275857343. The cubic root of 65642851 is about 403.3937312886.

The spelling of 65642851 in words is "sixty-five million, six hundred forty-two thousand, eight hundred fifty-one".