89980785521 has 4 divisors (see below), whose sum is σ = 98160856944. Its totient is φ = 81800714100.

The previous prime is 89980785491. The next prime is 89980785527. The reversal of 89980785521 is 12558708998.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89980785521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89980785527) 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, 4090035695 + ... + 4090035716.

It is an arithmetic number, because the mean of its divisors is an integer number (24540214236).

Almost surely, 2^89980785521 is an apocalyptic number.

It is an amenable number.

89980785521 is a deficient number, since it is larger than the sum of its proper divisors (8180071423).

89980785521 is a wasteful number, since it uses less digits than its factorization.

89980785521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8180071422.

The product of its (nonzero) digits is 14515200, while the sum is 62.

The spelling of 89980785521 in words is "eighty-nine billion, nine hundred eighty million, seven hundred eighty-five thousand, five hundred twenty-one".