65903581 has 2 divisors, whose sum is σ = 65903582. Its totient is φ = 65903580.

The previous prime is 65903569. The next prime is 65903587. The reversal of 65903581 is 18530956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53158681 + 12744900 = 7291^2 + 3570^2 .

It is a cyclic number.

It is not a de Polignac number, because 65903581 - 2²¹ = 63806429 is a prime.

It is a super-2 number, since 2×65903581² = 8686563977247122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65903581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65903587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32951790 + 32951791.

It is an arithmetic number, because the mean of its divisors is an integer number (32951791).

Almost surely, 2^65903581 is an apocalyptic number.

It is an amenable number.

65903581 is a deficient number, since it is larger than the sum of its proper divisors (1).

65903581 is an equidigital number, since it uses as much as digits as its factorization.

65903581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 65903581 is about 8118.1020565154. The cubic root of 65903581 is about 403.9271120508.

The spelling of 65903581 in words is "sixty-five million, nine hundred three thousand, five hundred eighty-one".