89861644899 has 24 divisors (see below), whose sum is σ = 141091200432. Its totient is φ = 54782648640.

The previous prime is 89861644871. The next prime is 89861644907. The reversal of 89861644899 is 99844616898.

89861644899 is a `hidden beast` number, since 8 + 9 + 86 + 1 + 64 + 489 + 9 = 666.

It is not a de Polignac number, because 89861644899 - 2⁹ = 89861644387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89861644699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3576492 + ... + 3601529.

It is an arithmetic number, because the mean of its divisors is an integer number (5878800018).

Almost surely, 2^89861644899 is an apocalyptic number.

89861644899 is a deficient number, since it is larger than the sum of its proper divisors (51229555533).

89861644899 is a wasteful number, since it uses less digits than its factorization.

89861644899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7178147 (or 7178144 counting only the distinct ones).

The product of its digits is 214990848, while the sum is 72.

The spelling of 89861644899 in words is "eighty-nine billion, eight hundred sixty-one million, six hundred forty-four thousand, eight hundred ninety-nine".