6691955389 has 8 divisors (see below), whose sum is σ = 7654181760. Its totient is φ = 5731287216.

The previous prime is 6691955381. The next prime is 6691955393. The reversal of 6691955389 is 9835591966.

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 6691955389 - 2³ = 6691955381 is a prime.

It is a super-2 number, since 2×6691955389² = 89564533856732282642, 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 (6691955381) 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, 380329 + ... + 397534.

It is an arithmetic number, because the mean of its divisors is an integer number (956772720).

Almost surely, 2^6691955389 is an apocalyptic number.

It is an amenable number.

6691955389 is a deficient number, since it is larger than the sum of its proper divisors (962226371).

6691955389 is a wasteful number, since it uses less digits than its factorization.

6691955389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779099.

The product of its digits is 15746400, while the sum is 61.

The square root of 6691955389 is about 81804.3726765263. The cubic root of 6691955389 is about 1884.4488149170.

The spelling of 6691955389 in words is "six billion, six hundred ninety-one million, nine hundred fifty-five thousand, three hundred eighty-nine".