64734981161 has 4 divisors (see below), whose sum is σ = 64968681732. Its totient is φ = 64501280592.

The previous prime is 64734981151. The next prime is 64734981163. The reversal of 64734981161 is 16118943746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11630544025 + 53104437136 = 107845^2 + 230444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64734981161 is a prime.

It is a super-3 number, since 3×64734981161³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64734981163) 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, 116849870 + ... + 116850423.

It is an arithmetic number, because the mean of its divisors is an integer number (16242170433).

Almost surely, 2^64734981161 is an apocalyptic number.

It is an amenable number.

64734981161 is a deficient number, since it is larger than the sum of its proper divisors (233700571).

64734981161 is a wasteful number, since it uses less digits than its factorization.

64734981161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233700570.

The product of its digits is 870912, while the sum is 50.

The spelling of 64734981161 in words is "sixty-four billion, seven hundred thirty-four million, nine hundred eighty-one thousand, one hundred sixty-one".