19904779969 has 8 divisors (see below), whose sum is σ = 20000800512. Its totient is φ = 19808820240.

The previous prime is 19904779913. The next prime is 19904780033. The reversal of 19904779969 is 96997740991.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19904779969 is a prime.

It is a super-2 number, since 2×19904779969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19904779898 and 19904779907.

It is not an unprimeable number, because it can be changed into a prime (19904779369) 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, 727599 + ... + 754459.

It is an arithmetic number, because the mean of its divisors is an integer number (2500100064).

Almost surely, 2^19904779969 is an apocalyptic number.

It is an amenable number.

19904779969 is a deficient number, since it is larger than the sum of its proper divisors (96020543).

19904779969 is a wasteful number, since it uses less digits than its factorization.

19904779969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30407.

The product of its (nonzero) digits is 69441624, while the sum is 70.

The spelling of 19904779969 in words is "nineteen billion, nine hundred four million, seven hundred seventy-nine thousand, nine hundred sixty-nine".