65653921 has 2 divisors, whose sum is σ = 65653922. Its totient is φ = 65653920.

The previous prime is 65653919. The next prime is 65653933. The reversal of 65653921 is 12935656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62726400 + 2927521 = 7920^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 65653921 - 2¹ = 65653919 is a prime.

Together with 65653919, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65653321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32826960 + 32826961.

It is an arithmetic number, because the mean of its divisors is an integer number (32826961).

Almost surely, 2^65653921 is an apocalyptic number.

It is an amenable number.

65653921 is a deficient number, since it is larger than the sum of its proper divisors (1).

65653921 is an equidigital number, since it uses as much as digits as its factorization.

65653921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 37.

The square root of 65653921 is about 8102.7107192593. The cubic root of 65653921 is about 403.4164060990.

The spelling of 65653921 in words is "sixty-five million, six hundred fifty-three thousand, nine hundred twenty-one".