78791081387 has 2 divisors, whose sum is σ = 78791081388. Its totient is φ = 78791081386.

The previous prime is 78791081377. The next prime is 78791081407. The reversal of 78791081387 is 78318019787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78791081387 - 2³⁰ = 77717339563 is a prime.

It is a super-2 number, since 2×78791081387² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78791081377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39395540693 + 39395540694.

It is an arithmetic number, because the mean of its divisors is an integer number (39395540694).

Almost surely, 2^78791081387 is an apocalyptic number.

78791081387 is a deficient number, since it is larger than the sum of its proper divisors (1).

78791081387 is an equidigital number, since it uses as much as digits as its factorization.

78791081387 is an evil number, because the sum of its binary digits is even.

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

The spelling of 78791081387 in words is "seventy-eight billion, seven hundred ninety-one million, eighty-one thousand, three hundred eighty-seven".