6611899391 has 4 divisors (see below), whose sum is σ = 6695594400. Its totient is φ = 6528204384.

The previous prime is 6611899351. The next prime is 6611899397. The reversal of 6611899391 is 1939981166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1939981166 = 2 ⋅969990583.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6611899391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6611899397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41847386 + ... + 41847543.

It is an arithmetic number, because the mean of its divisors is an integer number (1673898600).

Almost surely, 2^6611899391 is an apocalyptic number.

6611899391 is a deficient number, since it is larger than the sum of its proper divisors (83695009).

6611899391 is an equidigital number, since it uses as much as digits as its factorization.

6611899391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83695008.

The product of its digits is 629856, while the sum is 53.

The square root of 6611899391 is about 81313.5867552281. The cubic root of 6611899391 is about 1876.9040820621.

The spelling of 6611899391 in words is "six billion, six hundred eleven million, eight hundred ninety-nine thousand, three hundred ninety-one".