64165449481 has 9 divisors (see below), whose sum is σ = 74643503949. Its totient is φ = 54997436844.

The previous prime is 64165449437. The next prime is 64165449529. The reversal of 64165449481 is 18494456146.

The square root of 64165449481 is 253309.

It is a perfect power (a square), and thus also a powerful number.

64165449481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64165449481 - 2¹³ = 64165441289 is a prime.

It is a super-2 number, since 2×64165449481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64165447481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1755070 + ... + 1791256.

It is an arithmetic number, because the mean of its divisors is an integer number (8293722661).

Almost surely, 2^64165449481 is an apocalyptic number.

64165449481 is the 253309-th square number.

64165449481 is the 126655-th centered octagonal number.

It is an amenable number.

64165449481 is a deficient number, since it is larger than the sum of its proper divisors (10478054468).

64165449481 is an frugal number, since it uses more digits than its factorization.

64165449481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72388 (or 36194 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 52.

The spelling of 64165449481 in words is "sixty-four billion, one hundred sixty-five million, four hundred forty-nine thousand, four hundred eighty-one".