105140778691 has 4 divisors (see below), whose sum is σ = 113228530912. Its totient is φ = 97053026472.

The previous prime is 105140778689. The next prime is 105140778733. The reversal of 105140778691 is 196877041501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 105140778691 - 2¹ = 105140778689 is a prime.

It is a super-2 number, since 2×105140778691² (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 (105140778091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4043876091 + ... + 4043876116.

It is an arithmetic number, because the mean of its divisors is an integer number (28307132728).

Almost surely, 2^105140778691 is an apocalyptic number.

105140778691 is a deficient number, since it is larger than the sum of its proper divisors (8087752221).

105140778691 is an equidigital number, since it uses as much as digits as its factorization.

105140778691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087752220.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 105140778691 in words is "one hundred five billion, one hundred forty million, seven hundred seventy-eight thousand, six hundred ninety-one".