138821171628067 has 4 divisors (see below), whose sum is σ = 138838161132216. Its totient is φ = 138804182123920.

The previous prime is 138821171628037. The next prime is 138821171628101. The reversal of 138821171628067 is 760826171128831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138821171628067 - 2³⁵ = 138786811889699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138821171627996 and 138821171628014.

It is not an unprimeable number, because it can be changed into a prime (138821171628037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8494739818 + ... + 8494756159.

It is an arithmetic number, because the mean of its divisors is an integer number (34709540283054).

Almost surely, 2^{138821171628067} is an apocalyptic number.

138821171628067 is a deficient number, since it is larger than the sum of its proper divisors (16989504149).

138821171628067 is an equidigital number, since it uses as much as digits as its factorization.

138821171628067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16989504148.

The product of its (nonzero) digits is 10838016, while the sum is 61.

The spelling of 138821171628067 in words is "one hundred thirty-eight trillion, eight hundred twenty-one billion, one hundred seventy-one million, six hundred twenty-eight thousand, sixty-seven".