55506152121172 has 24 divisors (see below), whose sum is σ = 99403074783936. Its totient is φ = 27105381887808.

The previous prime is 55506152121163. The next prime is 55506152121179. The reversal of 55506152121172 is 27112125160555.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55506152121179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11477113 + ... + 15580000.

It is an arithmetic number, because the mean of its divisors is an integer number (4141794782664).

Almost surely, 2^{55506152121172} is an apocalyptic number.

It is an amenable number.

55506152121172 is a deficient number, since it is larger than the sum of its proper divisors (43896922662764).

55506152121172 is a wasteful number, since it uses less digits than its factorization.

55506152121172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27069087 (or 27069085 counting only the distinct ones).

The product of its (nonzero) digits is 210000, while the sum is 43.

The spelling of 55506152121172 in words is "fifty-five trillion, five hundred six billion, one hundred fifty-two million, one hundred twenty-one thousand, one hundred seventy-two".