138766387665 has 8 divisors (see below), whose sum is σ = 222026220288. Its totient is φ = 74008740080.

The previous prime is 138766387663. The next prime is 138766387673. The reversal of 138766387665 is 566783667831.

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

It is not a de Polignac number, because 138766387665 - 2¹ = 138766387663 is a prime.

It is a super-2 number, since 2×138766387665² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138766387596 and 138766387605.

It is not an unprimeable number, because it can be changed into a prime (138766387663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4625546241 + ... + 4625546270.

It is an arithmetic number, because the mean of its divisors is an integer number (27753277536).

Almost surely, 2^138766387665 is an apocalyptic number.

138766387665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138766387665 is a deficient number, since it is larger than the sum of its proper divisors (83259832623).

138766387665 is an equidigital number, since it uses as much as digits as its factorization.

138766387665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9251092519.

The product of its digits is 182891520, while the sum is 66.

The spelling of 138766387665 in words is "one hundred thirty-eight billion, seven hundred sixty-six million, three hundred eighty-seven thousand, six hundred sixty-five".