138665420769 has 16 divisors (see below), whose sum is σ = 195843320640. Its totient is φ = 86970032640.

The previous prime is 138665420743. The next prime is 138665420783. The reversal of 138665420769 is 967024566831.

It is not a de Polignac number, because 138665420769 - 2⁵ = 138665420737 is a prime.

It is a super-2 number, since 2×138665420769² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138665920769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432439 + ... + 681420.

It is an arithmetic number, because the mean of its divisors is an integer number (12240207540).

It is a 1-persistent number, because it is pandigital, but 2⋅138665420769 = 277330841538 is not.

Almost surely, 2^138665420769 is an apocalyptic number.

It is an amenable number.

138665420769 is a deficient number, since it is larger than the sum of its proper divisors (57177899871).

138665420769 is a wasteful number, since it uses less digits than its factorization.

138665420769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116320.

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 138665420769 in words is "one hundred thirty-eight billion, six hundred sixty-five million, four hundred twenty thousand, seven hundred sixty-nine".