53521166664173 has 4 divisors (see below), whose sum is σ = 57638179484508. Its totient is φ = 49404153843840.

The previous prime is 53521166664127. The next prime is 53521166664197. The reversal of 53521166664173 is 37146666112535.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31534042408324 + 21987124255849 = 5615518^2 + 4689043^2 .

It is a cyclic number.

It is not a de Polignac number, because 53521166664173 - 2⁶ = 53521166664109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53521166661173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2058506410148 + ... + 2058506410173.

It is an arithmetic number, because the mean of its divisors is an integer number (14409544871127).

Almost surely, 2^{53521166664173} is an apocalyptic number.

It is an amenable number.

53521166664173 is a deficient number, since it is larger than the sum of its proper divisors (4117012820335).

53521166664173 is a wasteful number, since it uses less digits than its factorization.

53521166664173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117012820334.

The product of its digits is 16329600, while the sum is 56.

The spelling of 53521166664173 in words is "fifty-three trillion, five hundred twenty-one billion, one hundred sixty-six million, six hundred sixty-four thousand, one hundred seventy-three".