53385771981 has 8 divisors (see below), whose sum is σ = 73635547680. Its totient is φ = 34363255472.

The previous prime is 53385771979. The next prime is 53385771997. The reversal of 53385771981 is 18917758335.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53385771981 - 2¹ = 53385771979 is a prime.

It is a super-2 number, since 2×53385771981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53385771931) 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 7 ways as a sum of consecutive naturals, for example, 306814695 + ... + 306814868.

It is an arithmetic number, because the mean of its divisors is an integer number (9204443460).

Almost surely, 2^53385771981 is an apocalyptic number.

It is an amenable number.

53385771981 is a deficient number, since it is larger than the sum of its proper divisors (20249775699).

53385771981 is a wasteful number, since it uses less digits than its factorization.

53385771981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613629595.

The product of its digits is 6350400, while the sum is 57.

The spelling of 53385771981 in words is "fifty-three billion, three hundred eighty-five million, seven hundred seventy-one thousand, nine hundred eighty-one".