89231779661 has 4 divisors (see below), whose sum is σ = 89232542592. Its totient is φ = 89231016732.

The previous prime is 89231779643. The next prime is 89231779687. The reversal of 89231779661 is 16697713298.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 89231779661 - 2²⁶ = 89164670797 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 89231779661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89231779691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165131 + ... + 453576.

It is an arithmetic number, because the mean of its divisors is an integer number (22308135648).

Almost surely, 2^89231779661 is an apocalyptic number.

It is an amenable number.

89231779661 is a deficient number, since it is larger than the sum of its proper divisors (762931).

89231779661 is a wasteful number, since it uses less digits than its factorization.

89231779661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762930.

The product of its digits is 6858432, while the sum is 59.

The spelling of 89231779661 in words is "eighty-nine billion, two hundred thirty-one million, seven hundred seventy-nine thousand, six hundred sixty-one".