19390557128427 has 6 divisors (see below), whose sum is σ = 28008582518852. Its totient is φ = 12927038085612.

The previous prime is 19390557128387. The next prime is 19390557128513. The reversal of 19390557128427 is 72482175509391.

It is a happy number.

19390557128427 is a `hidden beast` number, since 1 + 9 + 3 + 90 + 55 + 71 + 2 + 8 + 427 = 666.

It is not a de Polignac number, because 19390557128427 - 2⁶ = 19390557128363 is a prime.

It is a super-2 number, since 2×19390557128427² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19390557120427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1077253173793 + ... + 1077253173810.

Almost surely, 2^{19390557128427} is an apocalyptic number.

19390557128427 is a deficient number, since it is larger than the sum of its proper divisors (8618025390425).

19390557128427 is a wasteful number, since it uses less digits than its factorization.

19390557128427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154506347609 (or 2154506347606 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 63.

The spelling of 19390557128427 in words is "nineteen trillion, three hundred ninety billion, five hundred fifty-seven million, one hundred twenty-eight thousand, four hundred twenty-seven".