19856054474 has 16 divisors (see below), whose sum is σ = 30254673696. Its totient is φ = 9771418800.

The previous prime is 19856054467. The next prime is 19856054489. The reversal of 19856054474 is 47445065891.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93644 + ... + 220184.

It is an arithmetic number, because the mean of its divisors is an integer number (1890917106).

Almost surely, 2^19856054474 is an apocalyptic number.

19856054474 is a deficient number, since it is larger than the sum of its proper divisors (10398619222).

19856054474 is a wasteful number, since it uses less digits than its factorization.

19856054474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127781.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 19856054474 in words is "nineteen billion, eight hundred fifty-six million, fifty-four thousand, four hundred seventy-four".