55350021720172 has 12 divisors (see below), whose sum is σ = 97118111991880. Its totient is φ = 27601989722496.

The previous prime is 55350021720143. The next prime is 55350021720193. The reversal of 55350021720172 is 27102712005355.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18255282693 + ... + 18255285724.

Almost surely, 2^{55350021720172} is an apocalyptic number.

It is an amenable number.

55350021720172 is a deficient number, since it is larger than the sum of its proper divisors (41768090271708).

55350021720172 is a wasteful number, since it uses less digits than its factorization.

55350021720172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36510568800 (or 36510568798 counting only the distinct ones).

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 55350021720172 in words is "fifty-five trillion, three hundred fifty billion, twenty-one million, seven hundred twenty thousand, one hundred seventy-two".