71322645969 has 9 divisors (see below), whose sum is σ = 103022757019. Its totient is φ = 47547896520.

The previous prime is 71322645967. The next prime is 71322645973. The reversal of 71322645969 is 96954622317.

The square root of 71322645969 is 267063.

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., 50047506369 + 21275139600 = 223713^2 + 145860^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 71322645969 - 2¹ = 71322645967 is a prime.

It is a super-2 number, since 2×71322645969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71322645967) 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, 756679 + ... + 845699.

Almost surely, 2^71322645969 is an apocalyptic number.

71322645969 is the 267063-rd square number.

71322645969 is the 133532-nd centered octagonal number.

It is an amenable number.

71322645969 is a deficient number, since it is larger than the sum of its proper divisors (31700111050).

71322645969 is an frugal number, since it uses more digits than its factorization.

71322645969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178048 (or 89024 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 71322645969 in words is "seventy-one billion, three hundred twenty-two million, six hundred forty-five thousand, nine hundred sixty-nine".