65506381 has 2 divisors, whose sum is σ = 65506382. Its totient is φ = 65506380.

The previous prime is 65506349. The next prime is 65506387. The reversal of 65506381 is 18360556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34703881 + 30802500 = 5891^2 + 5550^2 .

It is a cyclic number.

It is not a de Polignac number, because 65506381 - 2⁵ = 65506349 is a prime.

It is a super-2 number, since 2×65506381² = 8582171903434322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65506387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32753190 + 32753191.

It is an arithmetic number, because the mean of its divisors is an integer number (32753191).

Almost surely, 2^65506381 is an apocalyptic number.

It is an amenable number.

65506381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65506381 is an equidigital number, since it uses as much as digits as its factorization.

65506381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 65506381 is about 8093.6012380151. The cubic root of 65506381 is about 403.1139885300.

The spelling of 65506381 in words is "sixty-five million, five hundred six thousand, three hundred eighty-one".