19638089977 has 16 divisors (see below), whose sum is σ = 23531397120. Its totient is φ = 16177827600.

The previous prime is 19638089969. The next prime is 19638090001. The reversal of 19638089977 is 77998083691.

It is not a de Polignac number, because 19638089977 - 2³ = 19638089969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19638089927) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2037849 + ... + 2047462.

It is an arithmetic number, because the mean of its divisors is an integer number (1470712320).

Almost surely, 2^19638089977 is an apocalyptic number.

It is an amenable number.

19638089977 is a deficient number, since it is larger than the sum of its proper divisors (3893307143).

19638089977 is a wasteful number, since it uses less digits than its factorization.

19638089977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085364.

The product of its (nonzero) digits is 41150592, while the sum is 67.

The spelling of 19638089977 in words is "nineteen billion, six hundred thirty-eight million, eighty-nine thousand, nine hundred seventy-seven".