6386147681 has 4 divisors (see below), whose sum is σ = 6606359700. Its totient is φ = 6165935664.

The previous prime is 6386147671. The next prime is 6386147683. The reversal of 6386147681 is 1867416836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2080819456 + 4305328225 = 45616^2 + 65615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6386147681 is a prime.

It is a super-2 number, since 2×6386147681² = 81565764407083355522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6386147683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110105966 + ... + 110106023.

It is an arithmetic number, because the mean of its divisors is an integer number (1651589925).

Almost surely, 2^6386147681 is an apocalyptic number.

It is an amenable number.

6386147681 is a deficient number, since it is larger than the sum of its proper divisors (220212019).

6386147681 is a wasteful number, since it uses less digits than its factorization.

6386147681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220212018.

The product of its digits is 1161216, while the sum is 50.

The square root of 6386147681 is about 79913.3761081335. The cubic root of 6386147681 is about 1855.2950498293.

The spelling of 6386147681 in words is "six billion, three hundred eighty-six million, one hundred forty-seven thousand, six hundred eighty-one".