65464774321 has 4 divisors (see below), whose sum is σ = 65465369892. Its totient is φ = 65464178752.

The previous prime is 65464774307. The next prime is 65464774337. The reversal of 65464774321 is 12347746456.

65464774321 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5972198400 + 59492575921 = 77280^2 + 243911^2 .

It is a cyclic number.

It is not a de Polignac number, because 65464774321 - 2¹⁷ = 65464643249 is a prime.

It is a super-2 number, since 2×65464774321² (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 (65464774391) 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, 79636 + ... + 370501.

It is an arithmetic number, because the mean of its divisors is an integer number (16366342473).

Almost surely, 2^65464774321 is an apocalyptic number.

It is an amenable number.

65464774321 is a deficient number, since it is larger than the sum of its proper divisors (595571).

65464774321 is a wasteful number, since it uses less digits than its factorization.

65464774321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595570.

The product of its digits is 3386880, while the sum is 49.

The spelling of 65464774321 in words is "sixty-five billion, four hundred sixty-four million, seven hundred seventy-four thousand, three hundred twenty-one".