138692236681 has 8 divisors (see below), whose sum is σ = 146214319104. Its totient is φ = 131294486400.

The previous prime is 138692236633. The next prime is 138692236693. The reversal of 138692236681 is 186632296831.

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

It is a cyclic number.

It is not a de Polignac number, because 138692236681 - 2⁹ = 138692236169 is a prime.

It is a super-2 number, since 2×138692236681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138692236381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31080745 + ... + 31085206.

It is an arithmetic number, because the mean of its divisors is an integer number (18276789888).

Almost surely, 2^138692236681 is an apocalyptic number.

It is an amenable number.

138692236681 is a deficient number, since it is larger than the sum of its proper divisors (7522082423).

138692236681 is an equidigital number, since it uses as much as digits as its factorization.

138692236681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62166071.

The product of its digits is 4478976, while the sum is 55.

The spelling of 138692236681 in words is "one hundred thirty-eight billion, six hundred ninety-two million, two hundred thirty-six thousand, six hundred eighty-one".