19858782818 has 64 divisors (see below), whose sum is σ = 35721216000. Its totient is φ = 8272630800.

The previous prime is 19858782817. The next prime is 19858782841. The reversal of 19858782818 is 81828785891.

It is a super-2 number, since 2×19858782818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19858782817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4866503 + ... + 4870581.

It is an arithmetic number, because the mean of its divisors is an integer number (558144000).

Almost surely, 2^19858782818 is an apocalyptic number.

19858782818 is a deficient number, since it is larger than the sum of its proper divisors (15862433182).

19858782818 is a wasteful number, since it uses less digits than its factorization.

19858782818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300 (or 4286 counting only the distinct ones).

The product of its digits is 20643840, while the sum is 65.

The spelling of 19858782818 in words is "nineteen billion, eight hundred fifty-eight million, seven hundred eighty-two thousand, eight hundred eighteen".