106638840781 has 4 divisors (see below), whose sum is σ = 116333280864. Its totient is φ = 96944400700.

The previous prime is 106638840769. The next prime is 106638840787. The reversal of 106638840781 is 187048836601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 187048836601 = 11 ⋅17004439691.

It is a cyclic number.

It is not a de Polignac number, because 106638840781 - 2¹⁵ = 106638808013 is a prime.

It is a super-2 number, since 2×106638840781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106638840787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4847220025 + ... + 4847220046.

It is an arithmetic number, because the mean of its divisors is an integer number (29083320216).

Almost surely, 2^106638840781 is an apocalyptic number.

106638840781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

106638840781 is a deficient number, since it is larger than the sum of its proper divisors (9694440083).

106638840781 is an equidigital number, since it uses as much as digits as its factorization.

106638840781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9694440082.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 106638840781 in words is "one hundred six billion, six hundred thirty-eight million, eight hundred forty thousand, seven hundred eighty-one".