19475039851 has 2 divisors, whose sum is σ = 19475039852. Its totient is φ = 19475039850.

The previous prime is 19475039807. The next prime is 19475039863. The reversal of 19475039851 is 15893057491.

It is a strong prime.

It is an emirp because it is prime and its reverse (15893057491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19475039851 is a prime.

It is not a weakly prime, because it can be changed into another prime (19475034851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9737519925 + 9737519926.

It is an arithmetic number, because the mean of its divisors is an integer number (9737519926).

Almost surely, 2^19475039851 is an apocalyptic number.

19475039851 is a deficient number, since it is larger than the sum of its proper divisors (1).

19475039851 is an equidigital number, since it uses as much as digits as its factorization.

19475039851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 19475039851 in words is "nineteen billion, four hundred seventy-five million, thirty-nine thousand, eight hundred fifty-one".