55521205401 has 16 divisors (see below), whose sum is σ = 74715408000. Its totient is φ = 36671634048.

The previous prime is 55521205391. The next prime is 55521205409. The reversal of 55521205401 is 10450212555.

It is not a de Polignac number, because 55521205401 - 2¹⁰ = 55521204377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55521205409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76500 + ... + 341898.

It is an arithmetic number, because the mean of its divisors is an integer number (4669713000).

Almost surely, 2^55521205401 is an apocalyptic number.

It is an amenable number.

55521205401 is a deficient number, since it is larger than the sum of its proper divisors (19194202599).

55521205401 is a wasteful number, since it uses less digits than its factorization.

55521205401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266048.

The product of its (nonzero) digits is 10000, while the sum is 30.

Adding to 55521205401 its reverse (10450212555), we get a palindrome (65971417956).

The spelling of 55521205401 in words is "fifty-five billion, five hundred twenty-one million, two hundred five thousand, four hundred one".