19408379691 has 8 divisors (see below), whose sum is σ = 25893463504. Its totient is φ = 12931107840.

The previous prime is 19408379687. The next prime is 19408379707. The reversal of 19408379691 is 19697380491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19408379691 - 2² = 19408379687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19408379791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1947190 + ... + 1957131.

It is an arithmetic number, because the mean of its divisors is an integer number (3236682938).

Almost surely, 2^19408379691 is an apocalyptic number.

19408379691 is a deficient number, since it is larger than the sum of its proper divisors (6485083813).

19408379691 is a wasteful number, since it uses less digits than its factorization.

19408379691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905981.

The product of its (nonzero) digits is 2939328, while the sum is 57.

The spelling of 19408379691 in words is "nineteen billion, four hundred eight million, three hundred seventy-nine thousand, six hundred ninety-one".