99769566891 has 8 divisors (see below), whose sum is σ = 133033431184. Its totient is φ = 66509373600.

The previous prime is 99769566887. The next prime is 99769566943. The reversal of 99769566891 is 19866596799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99769566891 - 2² = 99769566887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99769566851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853696 + ... + 963501.

It is an arithmetic number, because the mean of its divisors is an integer number (16629178898).

Almost surely, 2^99769566891 is an apocalyptic number.

99769566891 is a deficient number, since it is larger than the sum of its proper divisors (33263864293).

99769566891 is a wasteful number, since it uses less digits than its factorization.

99769566891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835501.

The product of its digits is 396809280, while the sum is 75.

The spelling of 99769566891 in words is "ninety-nine billion, seven hundred sixty-nine million, five hundred sixty-six thousand, eight hundred ninety-one".