19242039680638 has 4 divisors (see below), whose sum is σ = 28863059520960. Its totient is φ = 9621019840318.

The previous prime is 19242039680627. The next prime is 19242039680653. The reversal of 19242039680638 is 83608693024291.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4810509920158 + ... + 4810509920161.

It is an arithmetic number, because the mean of its divisors is an integer number (7215764880240).

Almost surely, 2^{19242039680638} is an apocalyptic number.

19242039680638 is a deficient number, since it is larger than the sum of its proper divisors (9621019840322).

19242039680638 is an equidigital number, since it uses as much as digits as its factorization.

19242039680638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9621019840321.

The product of its (nonzero) digits is 26873856, while the sum is 61.

The spelling of 19242039680638 in words is "nineteen trillion, two hundred forty-two billion, thirty-nine million, six hundred eighty thousand, six hundred thirty-eight".