19930357718 has 8 divisors (see below), whose sum is σ = 29906009112. Its totient is φ = 9961688016.

The previous prime is 19930357717. The next prime is 19930357787. The reversal of 19930357718 is 81775303991.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19930357718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19930357717) 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, 1738280 + ... + 1749707.

It is an arithmetic number, because the mean of its divisors is an integer number (3738251139).

Almost surely, 2^19930357718 is an apocalyptic number.

19930357718 is a deficient number, since it is larger than the sum of its proper divisors (9975651394).

19930357718 is a wasteful number, since it uses less digits than its factorization.

19930357718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490846.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 19930357718 in words is "nineteen billion, nine hundred thirty million, three hundred fifty-seven thousand, seven hundred eighteen".