53778536681 has 16 divisors (see below), whose sum is σ = 59086540800. Its totient is φ = 48719510928.

The previous prime is 53778536677. The next prime is 53778536687. The reversal of 53778536681 is 18663587735.

It is a happy number.

53778536681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 53778536681 - 2² = 53778536677 is a prime.

It is a super-2 number, since 2×53778536681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53778536681.

It is not an unprimeable number, because it can be changed into a prime (53778536687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1788590 + ... + 1818408.

It is an arithmetic number, because the mean of its divisors is an integer number (3692908800).

Almost surely, 2^53778536681 is an apocalyptic number.

It is an amenable number.

53778536681 is a deficient number, since it is larger than the sum of its proper divisors (5308004119).

53778536681 is a wasteful number, since it uses less digits than its factorization.

53778536681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33988.

The product of its digits is 25401600, while the sum is 59.

The spelling of 53778536681 in words is "fifty-three billion, seven hundred seventy-eight million, five hundred thirty-six thousand, six hundred eighty-one".