65443730881 has 4 divisors (see below), whose sum is σ = 65455759792. Its totient is φ = 65431701972.

The previous prime is 65443730861. The next prime is 65443730899. The reversal of 65443730881 is 18803734456.

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 a cyclic number.

It is not a de Polignac number, because 65443730881 - 2¹³ = 65443722689 is a prime.

It is a super-2 number, since 2×65443730881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65443730801) 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, 6006291 + ... + 6017176.

It is an arithmetic number, because the mean of its divisors is an integer number (16363939948).

Almost surely, 2^65443730881 is an apocalyptic number.

It is an amenable number.

65443730881 is a deficient number, since it is larger than the sum of its proper divisors (12028911).

65443730881 is a wasteful number, since it uses less digits than its factorization.

65443730881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12028910.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 65443730881 in words is "sixty-five billion, four hundred forty-three million, seven hundred thirty thousand, eight hundred eighty-one".