53521166664144 has 30 divisors (see below), whose sum is σ = 149784931706306. Its totient is φ = 17840388888000.

The previous prime is 53521166664127. The next prime is 53521166664197. The reversal of 53521166664144 is 44146666112535.

It can be written as a sum of positive squares in only one way, i.e., 28143873806400 + 25377292857744 = 5305080^2 + 5037588^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 185837384107 + ... + 185837384394.

Almost surely, 2^{53521166664144} is an apocalyptic number.

It is an amenable number.

53521166664144 is an abundant number, since it is smaller than the sum of its proper divisors (96263765042162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53521166664144 is a wasteful number, since it uses less digits than its factorization.

53521166664144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371674768515 (or 371674768506 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 53521166664144 in words is "fifty-three trillion, five hundred twenty-one billion, one hundred sixty-six million, six hundred sixty-four thousand, one hundred forty-four".