138066424901 has 4 divisors (see below), whose sum is σ = 138321631404. Its totient is φ = 137811218400.

The previous prime is 138066424883. The next prime is 138066424921. The reversal of 138066424901 is 109424660831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91948432900 + 46117992001 = 303230^2 + 214751^2 .

It is a cyclic number.

It is not a de Polignac number, because 138066424901 - 2²² = 138062230597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138066424921) 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, 127602440 + ... + 127603521.

It is an arithmetic number, because the mean of its divisors is an integer number (34580407851).

Almost surely, 2^138066424901 is an apocalyptic number.

It is an amenable number.

138066424901 is a deficient number, since it is larger than the sum of its proper divisors (255206503).

138066424901 is an equidigital number, since it uses as much as digits as its factorization.

138066424901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255206502.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 138066424901 in words is "one hundred thirty-eight billion, sixty-six million, four hundred twenty-four thousand, nine hundred one".