109776781439 has 4 divisors (see below), whose sum is σ = 118221149256. Its totient is φ = 101332413624.

The previous prime is 109776781423. The next prime is 109776781451. The reversal of 109776781439 is 934187677901.

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

It is not a de Polignac number, because 109776781439 - 2⁴ = 109776781423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109776781409) 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, 4222183889 + ... + 4222183914.

It is an arithmetic number, because the mean of its divisors is an integer number (29555287314).

Almost surely, 2^109776781439 is an apocalyptic number.

109776781439 is a deficient number, since it is larger than the sum of its proper divisors (8444367817).

109776781439 is an equidigital number, since it uses as much as digits as its factorization.

109776781439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8444367816.

The product of its (nonzero) digits is 16003008, while the sum is 62.

The spelling of 109776781439 in words is "one hundred nine billion, seven hundred seventy-six million, seven hundred eighty-one thousand, four hundred thirty-nine".