19851323785 has 32 divisors (see below), whose sum is σ = 25601443200. Its totient is φ = 14731591680.

The previous prime is 19851323771. The next prime is 19851323801. The reversal of 19851323785 is 58732315891.

It is not a de Polignac number, because 19851323785 - 2²¹ = 19849226633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1433595 + ... + 1447375.

It is an arithmetic number, because the mean of its divisors is an integer number (800045100).

Almost surely, 2^19851323785 is an apocalyptic number.

It is an amenable number.

19851323785 is a deficient number, since it is larger than the sum of its proper divisors (5750119415).

19851323785 is a wasteful number, since it uses less digits than its factorization.

19851323785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14121.

The product of its digits is 1814400, while the sum is 52.

The spelling of 19851323785 in words is "nineteen billion, eight hundred fifty-one million, three hundred twenty-three thousand, seven hundred eighty-five".