1172055017551 has 4 divisors (see below), whose sum is σ = 1278605473704. Its totient is φ = 1065504561400.

The previous prime is 1172055017543. The next prime is 1172055017587. The reversal of 1172055017551 is 1557105502711.

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

It is a cyclic number.

It is not a de Polignac number, because 1172055017551 - 2³ = 1172055017543 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172055017521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53275228060 + ... + 53275228081.

It is an arithmetic number, because the mean of its divisors is an integer number (319651368426).

Almost surely, 2^{1172055017551} is an apocalyptic number.

1172055017551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1172055017551 is a deficient number, since it is larger than the sum of its proper divisors (106550456153).

1172055017551 is a wasteful number, since it uses less digits than its factorization.

1172055017551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106550456152.

The product of its (nonzero) digits is 61250, while the sum is 40.

It can be divided in two parts, 117205 and 5017551, that added together give a square (5134756 = 2266²).

The spelling of 1172055017551 in words is "one trillion, one hundred seventy-two billion, fifty-five million, seventeen thousand, five hundred fifty-one".