65530813 has 2 divisors, whose sum is σ = 65530814. Its totient is φ = 65530812.

The previous prime is 65530793. The next prime is 65530823. The reversal of 65530813 is 31803556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45657049 + 19873764 = 6757^2 + 4458^2 .

It is a cyclic number.

It is not a de Polignac number, because 65530813 - 2²¹ = 63433661 is a prime.

It is a super-3 number, since 3×65530813³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65530823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32765406 + 32765407.

It is an arithmetic number, because the mean of its divisors is an integer number (32765407).

Almost surely, 2^65530813 is an apocalyptic number.

It is an amenable number.

65530813 is a deficient number, since it is larger than the sum of its proper divisors (1).

65530813 is an equidigital number, since it uses as much as digits as its factorization.

65530813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 65530813 is about 8095.1104377890. The cubic root of 65530813 is about 403.1640989499.

The spelling of 65530813 in words is "sixty-five million, five hundred thirty thousand, eight hundred thirteen".