65261813 has 2 divisors, whose sum is σ = 65261814. Its totient is φ = 65261812.

The previous prime is 65261783. The next prime is 65261839. The reversal of 65261813 is 31816256.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55383364 + 9878449 = 7442^2 + 3143^2 .

It is a cyclic number.

It is not a de Polignac number, because 65261813 - 2²² = 61067509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65261813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65261893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32630906 + 32630907.

It is an arithmetic number, because the mean of its divisors is an integer number (32630907).

Almost surely, 2^65261813 is an apocalyptic number.

It is an amenable number.

65261813 is a deficient number, since it is larger than the sum of its proper divisors (1).

65261813 is an equidigital number, since it uses as much as digits as its factorization.

65261813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 65261813 is about 8078.4783839533. The cubic root of 65261813 is about 402.6116876892.

The spelling of 65261813 in words is "sixty-five million, two hundred sixty-one thousand, eight hundred thirteen".