6538177881 has 9 divisors (see below), whose sum is σ = 9444385119. Its totient is φ = 4358623536.

The previous prime is 6538177859. The next prime is 6538177903. The reversal of 6538177881 is 1887718356.

It is a happy number.

The square root of 6538177881 is 80859.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (6538177859) and next prime (6538177903).

It can be written as a sum of positive squares in only one way, i.e., 4493691225 + 2044486656 = 67035^2 + 45216^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 6538177881 - 2⁷ = 6538177753 is a prime.

It is a super-2 number, since 2×6538177881² = 85495540007195300322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6538177831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 229101 + ... + 256053.

Almost surely, 2^6538177881 is an apocalyptic number.

6538177881 is the 80859-th square number.

6538177881 is the 40430-th centered octagonal number.

It is an amenable number.

6538177881 is a deficient number, since it is larger than the sum of its proper divisors (2906207238).

6538177881 is an frugal number, since it uses more digits than its factorization.

6538177881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53912 (or 26956 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The cubic root of 6538177881 is about 1869.9022779631.

The spelling of 6538177881 in words is "six billion, five hundred thirty-eight million, one hundred seventy-seven thousand, eight hundred eighty-one".