84889736521 has 4 divisors (see below), whose sum is σ = 89883250452. Its totient is φ = 79896222592.

The previous prime is 84889736513. The next prime is 84889736527. The reversal of 84889736521 is 12563798848.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77006250000 + 7883486521 = 277500^2 + 88789^2 .

It is a cyclic number.

It is not a de Polignac number, because 84889736521 - 2³ = 84889736513 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 84889736521.

It is not an unprimeable number, because it can be changed into a prime (84889736527) 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, 2496756940 + ... + 2496756973.

It is an arithmetic number, because the mean of its divisors is an integer number (22470812613).

Almost surely, 2^84889736521 is an apocalyptic number.

It is an amenable number.

84889736521 is a deficient number, since it is larger than the sum of its proper divisors (4993513931).

84889736521 is a wasteful number, since it uses less digits than its factorization.

84889736521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993513930.

The product of its digits is 23224320, while the sum is 61.

The spelling of 84889736521 in words is "eighty-four billion, eight hundred eighty-nine million, seven hundred thirty-six thousand, five hundred twenty-one".