55220353505172 has 72 divisors (see below), whose sum is σ = 144399330621000. Its totient is φ = 17771910283008.

The previous prime is 55220353505153. The next prime is 55220353505237. The reversal of 55220353505172 is 27150535302255.

55220353505172 is a `hidden beast` number, since 5 + 5 + 2 + 20 + 3 + 53 + 505 + 1 + 72 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 417217813776 + 54803135691396 = 645924^2 + 7402914^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197331738 + ... + 197611374.

It is an arithmetic number, because the mean of its divisors is an integer number (2005546258625).

Almost surely, 2^{55220353505172} is an apocalyptic number.

It is an amenable number.

55220353505172 is an abundant number, since it is smaller than the sum of its proper divisors (89178977115828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55220353505172 is a wasteful number, since it uses less digits than its factorization.

55220353505172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468825 (or 468820 counting only the distinct ones).

The product of its (nonzero) digits is 1575000, while the sum is 45.

The spelling of 55220353505172 in words is "fifty-five trillion, two hundred twenty billion, three hundred fifty-three million, five hundred five thousand, one hundred seventy-two".