19864894802 has 8 divisors (see below), whose sum is σ = 29799742476. Its totient is φ = 9931647312.

The previous prime is 19864894799. The next prime is 19864894823. The reversal of 19864894802 is 20849846891.

It can be written as a sum of positive squares in 2 ways, for example, as 18618875401 + 1246019401 = 136451^2 + 35299^2 .

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

It is a super-2 number, since 2×19864894802² (a number of 21 digits) contains 22 as substring.

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, 368513 + ... + 418964.

Almost surely, 2^19864894802 is an apocalyptic number.

19864894802 is a deficient number, since it is larger than the sum of its proper divisors (9934847674).

19864894802 is a wasteful number, since it uses less digits than its factorization.

19864894802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800092.

The product of its (nonzero) digits is 7962624, while the sum is 59.

The spelling of 19864894802 in words is "nineteen billion, eight hundred sixty-four million, eight hundred ninety-four thousand, eight hundred two".