1538421826109 has 8 divisors (see below), whose sum is σ = 1834639693440. Its totient is φ = 1261314788976.

The previous prime is 1538421826093. The next prime is 1538421826111. The reversal of 1538421826109 is 9016281248351.

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 1538421826109 - 2⁴ = 1538421826093 is a prime.

It is a super-3 number, since 3×1538421826109³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538421826199) 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, 4777707374 + ... + 4777707695.

It is an arithmetic number, because the mean of its divisors is an integer number (229329961680).

Almost surely, 2^{1538421826109} is an apocalyptic number.

It is an amenable number.

1538421826109 is a deficient number, since it is larger than the sum of its proper divisors (296217867331).

1538421826109 is an equidigital number, since it uses as much as digits as its factorization.

1538421826109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9555415099.

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 1538421826109 in words is "one trillion, five hundred thirty-eight billion, four hundred twenty-one million, eight hundred twenty-six thousand, one hundred nine".