138203643547 has 4 divisors (see below), whose sum is σ = 146333269656. Its totient is φ = 130074017440.

The previous prime is 138203643499. The next prime is 138203643551. The reversal of 138203643547 is 745346302831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138203643547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138203643497 and 138203643506.

It is not an unprimeable number, because it can be changed into a prime (138203643577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4064813029 + ... + 4064813062.

It is an arithmetic number, because the mean of its divisors is an integer number (36583317414).

Almost surely, 2^138203643547 is an apocalyptic number.

138203643547 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138203643547 is a deficient number, since it is larger than the sum of its proper divisors (8129626109).

138203643547 is an equidigital number, since it uses as much as digits as its factorization.

138203643547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8129626108.

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 138203643547 in words is "one hundred thirty-eight billion, two hundred three million, six hundred forty-three thousand, five hundred forty-seven".