55731921453172 has 6 divisors (see below), whose sum is σ = 97530862543058. Its totient is φ = 27865960726584.

The previous prime is 55731921453167. The next prime is 55731921453199. The reversal of 55731921453172 is 27135412913755.

It can be written as a sum of positive squares in only one way, i.e., 53990223622416 + 1741697830756 = 7347804^2 + 1319734^2 .

It is a super-3 number, since 3×55731921453172³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6966490181643 + ... + 6966490181650.

Almost surely, 2^{55731921453172} is an apocalyptic number.

It is an amenable number.

55731921453172 is a deficient number, since it is larger than the sum of its proper divisors (41798941089886).

55731921453172 is a wasteful number, since it uses less digits than its factorization.

55731921453172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13932980363297 (or 13932980363295 counting only the distinct ones).

The product of its digits is 7938000, while the sum is 55.

The spelling of 55731921453172 in words is "fifty-five trillion, seven hundred thirty-one billion, nine hundred twenty-one million, four hundred fifty-three thousand, one hundred seventy-two".