78743801091 has 8 divisors (see below), whose sum is σ = 106470491904. Its totient is φ = 51756488840.

The previous prime is 78743801063. The next prime is 78743801093. The reversal of 78743801091 is 19010834787.

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

It is a cyclic number.

It is not a de Polignac number, because 78743801091 - 2⁶ = 78743801027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78743801091.

It is not an unprimeable number, because it can be changed into a prime (78743801093) 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, 184844391 + ... + 184844816.

It is an arithmetic number, because the mean of its divisors is an integer number (13308811488).

Almost surely, 2^78743801091 is an apocalyptic number.

78743801091 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78743801091 is a deficient number, since it is larger than the sum of its proper divisors (27726690813).

78743801091 is a wasteful number, since it uses less digits than its factorization.

78743801091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369689281.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 78743801091 in words is "seventy-eight billion, seven hundred forty-three million, eight hundred one thousand, ninety-one".