6581677781 has 8 divisors (see below), whose sum is σ = 7522496064. Its totient is φ = 5641004160.

The previous prime is 6581677741. The next prime is 6581677829. The reversal of 6581677781 is 1877761856.

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 6581677781 - 2¹⁸ = 6581415637 is a prime.

It is a super-2 number, since 2×6581677781² = 86636964825818167922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6581677741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91286 + ... + 146616.

It is an arithmetic number, because the mean of its divisors is an integer number (940312008).

Almost surely, 2^6581677781 is an apocalyptic number.

It is an amenable number.

6581677781 is a deficient number, since it is larger than the sum of its proper divisors (940818283).

6581677781 is a wasteful number, since it uses less digits than its factorization.

6581677781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72331.

The product of its digits is 3951360, while the sum is 56.

The square root of 6581677781 is about 81127.5402129265. The cubic root of 6581677781 is about 1874.0400686104.

The spelling of 6581677781 in words is "six billion, five hundred eighty-one million, six hundred seventy-seven thousand, seven hundred eighty-one".