84641527206889 has 9 divisors (see below), whose sum is σ = 85018137681847. Its totient is φ = 84266577824224.

The previous prime is 84641527206883. The next prime is 84641527206917. The reversal of 84641527206889 is 98860272514648.

The square root of 84641527206889 is 9200083.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 80280112646889 + 4361414560000 = 8959917^2 + 2088400^2 .

It is a de Polignac number, because none of the positive numbers 2^k-84641527206889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84641527206883) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2088398577 + ... + 2088439105.

Almost surely, 2^{84641527206889} is an apocalyptic number.

84641527206889 is the 9200083-rd square number.

84641527206889 is the 4600042-nd centered octagonal number.

It is an amenable number.

84641527206889 is a deficient number, since it is larger than the sum of its proper divisors (376610474958).

84641527206889 is an frugal number, since it uses more digits than its factorization.

84641527206889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81512 (or 40756 counting only the distinct ones).

The product of its (nonzero) digits is 371589120, while the sum is 70.

The spelling of 84641527206889 in words is "eighty-four trillion, six hundred forty-one billion, five hundred twenty-seven million, two hundred six thousand, eight hundred eighty-nine".