55172343521 has 4 divisors (see below), whose sum is σ = 55177964292. Its totient is φ = 55166722752.

The previous prime is 55172343517. The next prime is 55172343529. The reversal of 55172343521 is 12534327155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11193640000 + 43978703521 = 105800^2 + 209711^2 .

It is a cyclic number.

It is not a de Polignac number, because 55172343521 - 2² = 55172343517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55172343529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2795636 + ... + 2815301.

It is an arithmetic number, because the mean of its divisors is an integer number (13794491073).

Almost surely, 2^55172343521 is an apocalyptic number.

It is an amenable number.

55172343521 is a deficient number, since it is larger than the sum of its proper divisors (5620771).

55172343521 is an equidigital number, since it uses as much as digits as its factorization.

55172343521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5620770.

The product of its digits is 126000, while the sum is 38.

The spelling of 55172343521 in words is "fifty-five billion, one hundred seventy-two million, three hundred forty-three thousand, five hundred twenty-one".