55506221221503 has 32 divisors (see below), whose sum is σ = 84423026181312. Its totient is φ = 32135646412800.

The previous prime is 55506221221501. The next prime is 55506221221573. The reversal of 55506221221503 is 30512212260555.

It is not a de Polignac number, because 55506221221503 - 2¹ = 55506221221501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55506221221501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14933058 + ... + 18275903.

It is an arithmetic number, because the mean of its divisors is an integer number (2638219568166).

Almost surely, 2^{55506221221503} is an apocalyptic number.

55506221221503 is a deficient number, since it is larger than the sum of its proper divisors (28916804959809).

55506221221503 is a wasteful number, since it uses less digits than its factorization.

55506221221503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33211515.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 55506221221503 in words is "fifty-five trillion, five hundred six billion, two hundred twenty-one million, two hundred twenty-one thousand, five hundred three".