864451798081 has 9 divisors (see below), whose sum is σ = 877609876899. Its totient is φ = 851488168344.

The previous prime is 864451798061. The next prime is 864451798087. The reversal of 864451798081 is 180897154468.

The square root of 864451798081 is 929759.

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

It can be written as a sum of positive squares in only one way, i.e., 64650690225 + 799801107856 = 254265^2 + 894316^2 .

It is not a de Polignac number, because 864451798081 - 2⁷ = 864451797953 is a prime.

It is a super-2 number, since 2×864451798081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864451798087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 62286915 + ... + 62300791.

Almost surely, 2^864451798081 is an apocalyptic number.

864451798081 is the 929759-th square number.

864451798081 is the 464880-th centered octagonal number.

It is an amenable number.

864451798081 is a deficient number, since it is larger than the sum of its proper divisors (13158078818).

864451798081 is an frugal number, since it uses more digits than its factorization.

864451798081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27888 (or 13944 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 61.

The spelling of 864451798081 in words is "eight hundred sixty-four billion, four hundred fifty-one million, seven hundred ninety-eight thousand, eighty-one".