138975062691 has 8 divisors (see below), whose sum is σ = 185374124800. Its totient is φ = 92613021192.

The previous prime is 138975062663. The next prime is 138975062701. The reversal of 138975062691 is 196260579831.

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

It is not a de Polignac number, because 138975062691 - 2⁹ = 138975062179 is a prime.

It is a super-2 number, since 2×138975062691² (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 (138975062641) 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, 9246391 + ... + 9261408.

It is an arithmetic number, because the mean of its divisors is an integer number (23171765600).

Almost surely, 2^138975062691 is an apocalyptic number.

138975062691 is a deficient number, since it is larger than the sum of its proper divisors (46399062109).

138975062691 is a wasteful number, since it uses less digits than its factorization.

138975062691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18510305.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The spelling of 138975062691 in words is "one hundred thirty-eight billion, nine hundred seventy-five million, sixty-two thousand, six hundred ninety-one".