19818614064 has 20 divisors (see below), whose sum is σ = 51198086456. Its totient is φ = 6606204672.

The previous prime is 19818614051. The next prime is 19818614111. The reversal of 19818614064 is 46041681891.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 412887793 = 19818614064 / (1 + 9 + 8 + 1 + 8 + 6 + 1 + 4 + 0 + 6 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206443849 + ... + 206443944.

Almost surely, 2^19818614064 is an apocalyptic number.

It is an amenable number.

19818614064 is an abundant number, since it is smaller than the sum of its proper divisors (31379472392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19818614064 is a wasteful number, since it uses less digits than its factorization.

19818614064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412887804 (or 412887798 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The spelling of 19818614064 in words is "nineteen billion, eight hundred eighteen million, six hundred fourteen thousand, sixty-four".