13078778177 has 4 divisors (see below), whose sum is σ = 13079838720. Its totient is φ = 13077717636.

The previous prime is 13078778161. The next prime is 13078778197. The reversal of 13078778177 is 77187787031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77187787031 = 3917 ⋅19705843.

It is a cyclic number.

It is not a de Polignac number, because 13078778177 - 2⁴ = 13078778161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13078778137) 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, 511553 + ... + 536510.

It is an arithmetic number, because the mean of its divisors is an integer number (3269959680).

Almost surely, 2^13078778177 is an apocalyptic number.

It is an amenable number.

13078778177 is a deficient number, since it is larger than the sum of its proper divisors (1060543).

13078778177 is a wasteful number, since it uses less digits than its factorization.

13078778177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060542.

The product of its (nonzero) digits is 3226944, while the sum is 56.

The spelling of 13078778177 in words is "thirteen billion, seventy-eight million, seven hundred seventy-eight thousand, one hundred seventy-seven".