65006818581 has 4 divisors (see below), whose sum is σ = 86675758112. Its totient is φ = 43337879052.

The previous prime is 65006818573. The next prime is 65006818603. The reversal of 65006818581 is 18581860056.

65006818581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65006818581 - 2³ = 65006818573 is a prime.

It is a super-2 number, since 2×65006818581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65006818581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65006810581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10834469761 + ... + 10834469766.

It is an arithmetic number, because the mean of its divisors is an integer number (21668939528).

Almost surely, 2^65006818581 is an apocalyptic number.

It is an amenable number.

65006818581 is a deficient number, since it is larger than the sum of its proper divisors (21668939531).

65006818581 is a wasteful number, since it uses less digits than its factorization.

65006818581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21668939530.

The product of its (nonzero) digits is 460800, while the sum is 48.

The spelling of 65006818581 in words is "sixty-five billion, six million, eight hundred eighteen thousand, five hundred eighty-one".