6690191379 has 4 divisors (see below), whose sum is σ = 8920255176. Its totient is φ = 4460127584.

The previous prime is 6690191357. The next prime is 6690191381. The reversal of 6690191379 is 9731910966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6690191379 - 2¹³ = 6690183187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6690190379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115031894 + ... + 1115031899.

It is an arithmetic number, because the mean of its divisors is an integer number (2230063794).

Almost surely, 2^6690191379 is an apocalyptic number.

6690191379 is a deficient number, since it is larger than the sum of its proper divisors (2230063797).

6690191379 is a wasteful number, since it uses less digits than its factorization.

6690191379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230063796.

The product of its (nonzero) digits is 551124, while the sum is 51.

The square root of 6690191379 is about 81793.5900850427. The cubic root of 6690191379 is about 1884.2832191386.

The spelling of 6690191379 in words is "six billion, six hundred ninety million, one hundred ninety-one thousand, three hundred seventy-nine".