8427385681 has 32 divisors (see below), whose sum is σ = 10413204480. Its totient is φ = 6714489600.

The previous prime is 8427385649. The next prime is 8427385691. The reversal of 8427385681 is 1865837248.

It is not a de Polignac number, because 8427385681 - 2⁵ = 8427385649 is a prime.

It is a super-2 number, since 2×8427385681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8427385691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217015 + ... + 252883.

It is an arithmetic number, because the mean of its divisors is an integer number (325412640).

Almost surely, 2^8427385681 is an apocalyptic number.

It is an amenable number.

8427385681 is a deficient number, since it is larger than the sum of its proper divisors (1985818799).

8427385681 is a wasteful number, since it uses less digits than its factorization.

8427385681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35977.

The product of its digits is 2580480, while the sum is 52.

The square root of 8427385681 is about 91800.7934660698. The cubic root of 8427385681 is about 2034.9994209441. Note that the first 3 decimals are identical.

The spelling of 8427385681 in words is "eight billion, four hundred twenty-seven million, three hundred eighty-five thousand, six hundred eighty-one".