79181380787 has 4 divisors (see below), whose sum is σ = 79712799600. Its totient is φ = 78649961976.

The previous prime is 79181380783. The next prime is 79181380793. The reversal of 79181380787 is 78708318197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78708318197 = 19 ⋅4142543063.

It is a cyclic number.

It is not a de Polignac number, because 79181380787 - 2² = 79181380783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79181380781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265709183 + ... + 265709480.

It is an arithmetic number, because the mean of its divisors is an integer number (19928199900).

Almost surely, 2^79181380787 is an apocalyptic number.

79181380787 is a deficient number, since it is larger than the sum of its proper divisors (531418813).

79181380787 is a wasteful number, since it uses less digits than its factorization.

79181380787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531418812.

The product of its (nonzero) digits is 4741632, while the sum is 59.

The spelling of 79181380787 in words is "seventy-nine billion, one hundred eighty-one million, three hundred eighty thousand, seven hundred eighty-seven".