53661144621013 has 16 divisors (see below), whose sum is σ = 57195539513280. Its totient is φ = 50198395935744.

The previous prime is 53661144620999. The next prime is 53661144621023. The reversal of 53661144621013 is 31012644116635.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53661144621013 is a prime.

It is a super-2 number, since 2×53661144621013² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53661144621023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5753356 + ... + 11850037.

It is an arithmetic number, because the mean of its divisors is an integer number (3574721219580).

Almost surely, 2^{53661144621013} is an apocalyptic number.

It is an amenable number.

53661144621013 is a deficient number, since it is larger than the sum of its proper divisors (3534394892267).

53661144621013 is a wasteful number, since it uses less digits than its factorization.

53661144621013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17605428.

The product of its (nonzero) digits is 311040, while the sum is 43.

Adding to 53661144621013 its reverse (31012644116635), we get a palindrome (84673788737648).

The spelling of 53661144621013 in words is "fifty-three trillion, six hundred sixty-one billion, one hundred forty-four million, six hundred twenty-one thousand, thirteen".