55850000221 has 4 divisors (see below), whose sum is σ = 55850597244. Its totient is φ = 55849403200.

The previous prime is 55850000209. The next prime is 55850000249. The reversal of 55850000221 is 12200005855.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7954677721 + 47895322500 = 89189^2 + 218850^2 .

It is a cyclic number.

It is not a de Polignac number, because 55850000221 - 2⁵ = 55850000189 is a prime.

It is a pancake number, because a pancake can be divided into 55850000221 parts by 334215 straight cuts.

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 55850000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55850000021) 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, 124300 + ... + 356581.

It is an arithmetic number, because the mean of its divisors is an integer number (13962649311).

Almost surely, 2^55850000221 is an apocalyptic number.

It is an amenable number.

55850000221 is a deficient number, since it is larger than the sum of its proper divisors (597023).

55850000221 is a wasteful number, since it uses less digits than its factorization.

55850000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597022.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 55850000221 in words is "fifty-five billion, eight hundred fifty million, two hundred twenty-one", and thus it is an aban number.