67877878771 has 4 divisors (see below), whose sum is σ = 68990630944. Its totient is φ = 66765126600.

The previous prime is 67877878759. The next prime is 67877878781. The reversal of 67877878771 is 17787877876.

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

It is a cyclic number.

It is not a de Polignac number, because 67877878771 - 2⁷ = 67877878643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67877878694 and 67877878703.

It is not an unprimeable number, because it can be changed into a prime (67877878741) 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, 556375995 + ... + 556376116.

It is an arithmetic number, because the mean of its divisors is an integer number (17247657736).

Almost surely, 2^67877878771 is an apocalyptic number.

67877878771 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

67877878771 is a deficient number, since it is larger than the sum of its proper divisors (1112752173).

67877878771 is a wasteful number, since it uses less digits than its factorization.

67877878771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112752172.

The product of its digits is 361417728, while the sum is 73.

The spelling of 67877878771 in words is "sixty-seven billion, eight hundred seventy-seven million, eight hundred seventy-eight thousand, seven hundred seventy-one".