53861881328639 has 4 divisors (see below), whose sum is σ = 53873128333080. Its totient is φ = 53850634324200.

The previous prime is 53861881328627. The next prime is 53861881328701. The reversal of 53861881328639 is 93682318816835.

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 53861881328639 - 2¹² = 53861881324543 is a prime.

It is a super-2 number, since 2×53861881328639² (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 (53861881328539) 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 3 ways as a sum of consecutive naturals, for example, 5623495037 + ... + 5623504614.

It is an arithmetic number, because the mean of its divisors is an integer number (13468282083270).

Almost surely, 2^{53861881328639} is an apocalyptic number.

53861881328639 is a deficient number, since it is larger than the sum of its proper divisors (11247004441).

53861881328639 is a wasteful number, since it uses less digits than its factorization.

53861881328639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11247004440.

The product of its digits is 358318080, while the sum is 71.

The spelling of 53861881328639 in words is "fifty-three trillion, eight hundred sixty-one billion, eight hundred eighty-one million, three hundred twenty-eight thousand, six hundred thirty-nine".