1909665141938 has 4 divisors (see below), whose sum is σ = 2864497712910. Its totient is φ = 954832570968.

The previous prime is 1909665141919. The next prime is 1909665141953. The reversal of 1909665141938 is 8391415669091.

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

It can be written as a sum of positive squares in only one way, i.e., 1636923212929 + 272741929009 = 1279423^2 + 522247^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 477416285483 + ... + 477416285486.

Almost surely, 2^{1909665141938} is an apocalyptic number.

1909665141938 is a deficient number, since it is larger than the sum of its proper divisors (954832570972).

1909665141938 is an equidigital number, since it uses as much as digits as its factorization.

1909665141938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954832570971.

The product of its (nonzero) digits is 12597120, while the sum is 62.

The spelling of 1909665141938 in words is "one trillion, nine hundred nine billion, six hundred sixty-five million, one hundred forty-one thousand, nine hundred thirty-eight".