6511696381 has 8 divisors (see below), whose sum is σ = 6619826304. Its totient is φ = 6403611120.

The previous prime is 6511696379. The next prime is 6511696459. The reversal of 6511696381 is 1836961156.

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 6511696381 - 2¹ = 6511696379 is a prime.

It is a super-2 number, since 2×6511696381² = 84804379516656994322, 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 (6511196381) 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, 418320 + ... + 433606.

It is an arithmetic number, because the mean of its divisors is an integer number (827478288).

Almost surely, 2^6511696381 is an apocalyptic number.

6511696381 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6511696381 is a deficient number, since it is larger than the sum of its proper divisors (108129923).

6511696381 is a wasteful number, since it uses less digits than its factorization.

6511696381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22331.

The product of its digits is 233280, while the sum is 46.

The square root of 6511696381 is about 80695.0827560143. The cubic root of 6511696381 is about 1867.3743146318.

The spelling of 6511696381 in words is "six billion, five hundred eleven million, six hundred ninety-six thousand, three hundred eighty-one".