216201308252557 has 8 divisors (see below), whose sum is σ = 219060066022200. Its totient is φ = 213352095585024.

The previous prime is 216201308252551. The next prime is 216201308252647. The reversal of 216201308252557 is 755252803102612.

It can be written as a sum of positive squares in 4 ways, for example, as 30501109973961 + 185700198278596 = 5522781^2 + 13627186^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216201308252557 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 216201308252557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216201308252551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2386229928 + ... + 2386320529.

It is an arithmetic number, because the mean of its divisors is an integer number (27382508252775).

Almost surely, 2^{216201308252557} is an apocalyptic number.

It is an amenable number.

216201308252557 is a deficient number, since it is larger than the sum of its proper divisors (2858757769643).

216201308252557 is an equidigital number, since it uses as much as digits as its factorization.

216201308252557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4772551055.

The product of its (nonzero) digits is 2016000, while the sum is 49.

The spelling of 216201308252557 in words is "two hundred sixteen trillion, two hundred one billion, three hundred eight million, two hundred fifty-two thousand, five hundred fifty-seven".