55005350025221 has 8 divisors (see below), whose sum is σ = 58241174808600. Its totient is φ = 51769549237248.

The previous prime is 55005350025211. The next prime is 55005350025229. The reversal of 55005350025221 is 12252005350055.

It can be written as a sum of positive squares in 4 ways, for example, as 7064889576196 + 47940460449025 = 2657986^2 + 6923905^2 .

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-55005350025221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55005350025229) 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, 1168196 + ... + 10553453.

It is an arithmetic number, because the mean of its divisors is an integer number (7280146851075).

Almost surely, 2^{55005350025221} is an apocalyptic number.

It is an amenable number.

55005350025221 is a deficient number, since it is larger than the sum of its proper divisors (3235824783379).

55005350025221 is a wasteful number, since it uses less digits than its factorization.

55005350025221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11997703.

The product of its (nonzero) digits is 75000, while the sum is 35.

Adding to 55005350025221 its reverse (12252005350055), we get a palindrome (67257355375276).

The spelling of 55005350025221 in words is "fifty-five trillion, five billion, three hundred fifty million, twenty-five thousand, two hundred twenty-one".