1938905164549 has 8 divisors (see below), whose sum is σ = 1942104479040. Its totient is φ = 1935708472896.

The previous prime is 1938905164523. The next prime is 1938905164577. The reversal of 1938905164549 is 9454615098391.

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

It is a cyclic number.

It is not a de Polignac number, because 1938905164549 - 2⁵ = 1938905164517 is a prime.

It is a super-2 number, since 2×1938905164549² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938905164519) 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, 826749 + ... + 2135725.

It is an arithmetic number, because the mean of its divisors is an integer number (242763059880).

Almost surely, 2^{1938905164549} is an apocalyptic number.

It is an amenable number.

1938905164549 is a deficient number, since it is larger than the sum of its proper divisors (3199314491).

1938905164549 is a wasteful number, since it uses less digits than its factorization.

1938905164549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311419.

The product of its (nonzero) digits is 41990400, while the sum is 64.

The spelling of 1938905164549 in words is "one trillion, nine hundred thirty-eight billion, nine hundred five million, one hundred sixty-four thousand, five hundred forty-nine".