65069821 has 2 divisors, whose sum is σ = 65069822. Its totient is φ = 65069820.

The previous prime is 65069819. The next prime is 65069891. The reversal of 65069821 is 12896056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37884025 + 27185796 = 6155^2 + 5214^2 .

It is a cyclic number.

It is not a de Polignac number, because 65069821 - 2¹ = 65069819 is a prime.

Together with 65069819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65069801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32534910 + 32534911.

It is an arithmetic number, because the mean of its divisors is an integer number (32534911).

Almost surely, 2^65069821 is an apocalyptic number.

It is an amenable number.

65069821 is a deficient number, since it is larger than the sum of its proper divisors (1).

65069821 is an equidigital number, since it uses as much as digits as its factorization.

65069821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 65069821 is about 8066.5867007056. The cubic root of 65069821 is about 402.2164890053.

The spelling of 65069821 in words is "sixty-five million, sixty-nine thousand, eight hundred twenty-one".