19313917642 has 8 divisors (see below), whose sum is σ = 29677483332. Its totient is φ = 9421423200.

The previous prime is 19313917613. The next prime is 19313917663. The reversal of 19313917642 is 24671931391.

It can be written as a sum of positive squares in 2 ways, for example, as 17200584801 + 2113332841 = 131151^2 + 45971^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 19313917592 and 19313917601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117767709 + ... + 117767872.

Almost surely, 2^19313917642 is an apocalyptic number.

19313917642 is a deficient number, since it is larger than the sum of its proper divisors (10363565690).

19313917642 is a wasteful number, since it uses less digits than its factorization.

19313917642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235535624.

The product of its digits is 244944, while the sum is 46.

The spelling of 19313917642 in words is "nineteen billion, three hundred thirteen million, nine hundred seventeen thousand, six hundred forty-two".