84565221601 has 9 divisors (see below), whose sum is σ = 98374156401. Its totient is φ = 72482730852.

The previous prime is 84565221599. The next prime is 84565221661. The reversal of 84565221601 is 10612256548.

The square root of 84565221601 is 290801.

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

It is not a de Polignac number, because 84565221601 - 2¹ = 84565221599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84565221661) 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, 2014836 + ... + 2056378.

Almost surely, 2^84565221601 is an apocalyptic number.

84565221601 is the 290801-st square number.

84565221601 is the 145401-st centered octagonal number.

It is an amenable number.

84565221601 is a deficient number, since it is larger than the sum of its proper divisors (13808934800).

84565221601 is an frugal number, since it uses more digits than its factorization.

84565221601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83100 (or 41550 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 84565221601 in words is "eighty-four billion, five hundred sixty-five million, two hundred twenty-one thousand, six hundred one".