65899381 has 2 divisors, whose sum is σ = 65899382. Its totient is φ = 65899380.

The previous prime is 65899373. The next prime is 65899403. The reversal of 65899381 is 18399856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64480900 + 1418481 = 8030^2 + 1191^2 .

It is a cyclic number.

It is not a de Polignac number, because 65899381 - 2³ = 65899373 is a prime.

It is a super-2 number, since 2×65899381² = 8685456832366322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65899321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32949690 + 32949691.

It is an arithmetic number, because the mean of its divisors is an integer number (32949691).

Almost surely, 2^65899381 is an apocalyptic number.

It is an amenable number.

65899381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65899381 is an equidigital number, since it uses as much as digits as its factorization.

65899381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 49.

The square root of 65899381 is about 8117.8433712409. The cubic root of 65899381 is about 403.9185311822.

The spelling of 65899381 in words is "sixty-five million, eight hundred ninety-nine thousand, three hundred eighty-one".