78689121277 has 16 divisors (see below), whose sum is σ = 85047229120. Its totient is φ = 72375057792.

The previous prime is 78689121271. The next prime is 78689121283. The reversal of 78689121277 is 77212198687.

It is an interprime number because it is at equal distance from previous prime (78689121271) and next prime (78689121283).

It is a cyclic number.

It is not a de Polignac number, because 78689121277 - 2³¹ = 76541637629 is a prime.

It is a super-2 number, since 2×78689121277² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78689121271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4381438 + ... + 4399360.

It is an arithmetic number, because the mean of its divisors is an integer number (5315451820).

Almost surely, 2^78689121277 is an apocalyptic number.

It is an amenable number.

78689121277 is a deficient number, since it is larger than the sum of its proper divisors (6358107843).

78689121277 is a wasteful number, since it uses less digits than its factorization.

78689121277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19132.

The product of its digits is 4741632, while the sum is 58.

The spelling of 78689121277 in words is "seventy-eight billion, six hundred eighty-nine million, one hundred twenty-one thousand, two hundred seventy-seven".