445773881569 has 9 divisors (see below), whose sum is σ = 447069559507. Its totient is φ = 444481953664.

The previous prime is 445773881551. The next prime is 445773881573. The reversal of 445773881569 is 965188377544.

The square root of 445773881569 is 667663.

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., 272418231969 + 173355649600 = 521937^2 + 416360^2 .

It is a de Polignac number, because none of the positive numbers 2^k-445773881569 is a prime.

It is a super-2 number, since 2×445773881569² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445773881549) 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, 299779944 + ... + 299781430.

Almost surely, 2^445773881569 is an apocalyptic number.

445773881569 is the 667663-rd square number.

445773881569 is the 333832-nd centered octagonal number.

It is an amenable number.

445773881569 is a deficient number, since it is larger than the sum of its proper divisors (1295677938).

445773881569 is an frugal number, since it uses more digits than its factorization.

445773881569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872 (or 1936 counting only the distinct ones).

The product of its digits is 203212800, while the sum is 67.

The spelling of 445773881569 in words is "four hundred forty-five billion, seven hundred seventy-three million, eight hundred eighty-one thousand, five hundred sixty-nine".