78127107681 has 24 divisors (see below), whose sum is σ = 121333676544. Its totient is φ = 44586242400.

The previous prime is 78127107673. The next prime is 78127107763. The reversal of 78127107681 is 18670172187.

It is not a de Polignac number, because 78127107681 - 2³ = 78127107673 is a prime.

It is a super-2 number, since 2×78127107681² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78127107681.

It is not an unprimeable number, because it can be changed into a prime (78127105681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230145 + ... + 457406.

It is an arithmetic number, because the mean of its divisors is an integer number (5055569856).

Almost surely, 2^78127107681 is an apocalyptic number.

It is an amenable number.

78127107681 is a deficient number, since it is larger than the sum of its proper divisors (43206568863).

78127107681 is a wasteful number, since it uses less digits than its factorization.

78127107681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688341 (or 688334 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 48.

The spelling of 78127107681 in words is "seventy-eight billion, one hundred twenty-seven million, one hundred seven thousand, six hundred eighty-one".