19939868553 has 16 divisors (see below), whose sum is σ = 29231824896. Its totient is φ = 11989610640.

The previous prime is 19939868527. The next prime is 19939868567. The reversal of 19939868553 is 35586893991.

It is not a de Polignac number, because 19939868553 - 2⁸ = 19939868297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19939868353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2374701 + ... + 2383082.

It is an arithmetic number, because the mean of its divisors is an integer number (1826989056).

Almost surely, 2^19939868553 is an apocalyptic number.

It is an amenable number.

19939868553 is a deficient number, since it is larger than the sum of its proper divisors (9291956343).

19939868553 is a wasteful number, since it uses less digits than its factorization.

19939868553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757924.

The product of its digits is 62985600, while the sum is 66.

The spelling of 19939868553 in words is "nineteen billion, nine hundred thirty-nine million, eight hundred sixty-eight thousand, five hundred fifty-three".