89863981577 has 4 divisors (see below), whose sum is σ = 89864759556. Its totient is φ = 89863203600.

The previous prime is 89863981573. The next prime is 89863981601. The reversal of 89863981577 is 77518936898.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 79041948736 + 10822032841 = 281144^2 + 104029^2 .

It is a cyclic number.

It is not a de Polignac number, because 89863981577 - 2² = 89863981573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89863981577.

It is not an unprimeable number, because it can be changed into a prime (89863981573) 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 3 ways as a sum of consecutive naturals, for example, 177338 + ... + 459539.

It is an arithmetic number, because the mean of its divisors is an integer number (22466189889).

Almost surely, 2^89863981577 is an apocalyptic number.

It is an amenable number.

89863981577 is a deficient number, since it is larger than the sum of its proper divisors (777979).

89863981577 is a wasteful number, since it uses less digits than its factorization.

89863981577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777978.

The product of its digits is 182891520, while the sum is 71.

The spelling of 89863981577 in words is "eighty-nine billion, eight hundred sixty-three million, nine hundred eighty-one thousand, five hundred seventy-seven".