19779340695 has 8 divisors (see below), whose sum is σ = 31646945136. Its totient is φ = 10548981696.

The previous prime is 19779340667. The next prime is 19779340709. The reversal of 19779340695 is 59604397791.

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

It is not a de Polignac number, because 19779340695 - 2²¹ = 19777243543 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659311342 + ... + 659311371.

It is an arithmetic number, because the mean of its divisors is an integer number (3955868142).

Almost surely, 2^19779340695 is an apocalyptic number.

19779340695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19779340695 is a deficient number, since it is larger than the sum of its proper divisors (11867604441).

19779340695 is a wasteful number, since it uses less digits than its factorization.

19779340695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318622721.

The product of its (nonzero) digits is 12859560, while the sum is 60.

The spelling of 19779340695 in words is "nineteen billion, seven hundred seventy-nine million, three hundred forty thousand, six hundred ninety-five".