78961105177 has 4 divisors (see below), whose sum is σ = 78975304720. Its totient is φ = 78946905636.

The previous prime is 78961105159. The next prime is 78961105187. The reversal of 78961105177 is 77150116987.

It is a happy number.

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: 77150116987 = 19 ⋅4060532473.

It is a cyclic number.

It is not a de Polignac number, because 78961105177 - 2³⁵ = 44601366809 is a prime.

It is a super-3 number, since 3×78961105177³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78961105187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7091427 + ... + 7102552.

It is an arithmetic number, because the mean of its divisors is an integer number (19743826180).

Almost surely, 2^78961105177 is an apocalyptic number.

It is an amenable number.

78961105177 is a deficient number, since it is larger than the sum of its proper divisors (14199543).

78961105177 is a wasteful number, since it uses less digits than its factorization.

78961105177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14199542.

The product of its (nonzero) digits is 740880, while the sum is 52.

The spelling of 78961105177 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred five thousand, one hundred seventy-seven".