78641171407 has 4 divisors (see below), whose sum is σ = 78855452896. Its totient is φ = 78426889920.

The previous prime is 78641171353. The next prime is 78641171429. The reversal of 78641171407 is 70417114687.

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 78641171407 - 2¹⁹ = 78640647119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78641771407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107140194 + ... + 107140927.

It is an arithmetic number, because the mean of its divisors is an integer number (19713863224).

Almost surely, 2^78641171407 is an apocalyptic number.

78641171407 is a deficient number, since it is larger than the sum of its proper divisors (214281489).

78641171407 is a wasteful number, since it uses less digits than its factorization.

78641171407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214281488.

The product of its (nonzero) digits is 263424, while the sum is 46.

The spelling of 78641171407 in words is "seventy-eight billion, six hundred forty-one million, one hundred seventy-one thousand, four hundred seven".