65838103892921 has 2 divisors, whose sum is σ = 65838103892922. Its totient is φ = 65838103892920.

The previous prime is 65838103892887. The next prime is 65838103892983. The reversal of 65838103892921 is 12929830183856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65837563981225 + 539911696 = 8114035^2 + 23236^2 .

It is a cyclic number.

It is not a de Polignac number, because 65838103892921 - 2¹⁸ = 65838103630777 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (65838103897921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32919051946460 + 32919051946461.

It is an arithmetic number, because the mean of its divisors is an integer number (32919051946461).

Almost surely, 2^{65838103892921} is an apocalyptic number.

It is an amenable number.

65838103892921 is a deficient number, since it is larger than the sum of its proper divisors (1).

65838103892921 is an equidigital number, since it uses as much as digits as its factorization.

65838103892921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44789760, while the sum is 65.

The spelling of 65838103892921 in words is "sixty-five trillion, eight hundred thirty-eight billion, one hundred three million, eight hundred ninety-two thousand, nine hundred twenty-one".