1988138622417 has 8 divisors (see below), whose sum is σ = 2653004914560. Its totient is φ = 1324349039280.

The previous prime is 1988138622403. The next prime is 1988138622451. The reversal of 1988138622417 is 7142268318891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1988138622417 - 2⁷ = 1988138622289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988138627417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269172942 + ... + 269180327.

It is an arithmetic number, because the mean of its divisors is an integer number (331625614320).

Almost surely, 2^{1988138622417} is an apocalyptic number.

It is an amenable number.

1988138622417 is a deficient number, since it is larger than the sum of its proper divisors (664866292143).

1988138622417 is a wasteful number, since it uses less digits than its factorization.

1988138622417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538354503.

The product of its digits is 9289728, while the sum is 60.

The spelling of 1988138622417 in words is "one trillion, nine hundred eighty-eight billion, one hundred thirty-eight million, six hundred twenty-two thousand, four hundred seventeen".