65862818921 has 2 divisors, whose sum is σ = 65862818922. Its totient is φ = 65862818920.

The previous prime is 65862818899. The next prime is 65862818969. The reversal of 65862818921 is 12981826856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65300180521 + 562638400 = 255539^2 + 23720^2 .

It is a cyclic number.

It is not a de Polignac number, because 65862818921 - 2¹⁸ = 65862556777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65862818621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32931409460 + 32931409461.

It is an arithmetic number, because the mean of its divisors is an integer number (32931409461).

Almost surely, 2^65862818921 is an apocalyptic number.

It is an amenable number.

65862818921 is a deficient number, since it is larger than the sum of its proper divisors (1).

65862818921 is an equidigital number, since it uses as much as digits as its factorization.

65862818921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 56.

The spelling of 65862818921 in words is "sixty-five billion, eight hundred sixty-two million, eight hundred eighteen thousand, nine hundred twenty-one".