65969621 has 2 divisors, whose sum is σ = 65969622. Its totient is φ = 65969620.

The previous prime is 65969593. The next prime is 65969627. The reversal of 65969621 is 12696956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63377521 + 2592100 = 7961^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 65969621 - 2¹⁰ = 65968597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65969627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32984810 + 32984811.

It is an arithmetic number, because the mean of its divisors is an integer number (32984811).

Almost surely, 2^65969621 is an apocalyptic number.

It is an amenable number.

65969621 is a deficient number, since it is larger than the sum of its proper divisors (1).

65969621 is an equidigital number, since it uses as much as digits as its factorization.

65969621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 65969621 is about 8122.1684912343. The cubic root of 65969621 is about 404.0619880866.

The spelling of 65969621 in words is "sixty-five million, nine hundred sixty-nine thousand, six hundred twenty-one".