78317426905 has 8 divisors (see below), whose sum is σ = 99509201352. Its totient is φ = 58968415488.

The previous prime is 78317426867. The next prime is 78317426909. The reversal of 78317426905 is 50962471387.

It can be written as a sum of positive squares in 4 ways, for example, as 18636891289 + 59680535616 = 136517^2 + 244296^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78317426905 - 2³¹ = 76169943257 is a prime.

It is a super-2 number, since 2×78317426905² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78317426909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460690662 + ... + 460690831.

It is an arithmetic number, because the mean of its divisors is an integer number (12438650169).

It is a 1-persistent number, because it is pandigital, but 2⋅78317426905 = 156634853810 is not.

Almost surely, 2^78317426905 is an apocalyptic number.

It is an amenable number.

78317426905 is a deficient number, since it is larger than the sum of its proper divisors (21191774447).

78317426905 is a wasteful number, since it uses less digits than its factorization.

78317426905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921381515.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 78317426905 in words is "seventy-eight billion, three hundred seventeen million, four hundred twenty-six thousand, nine hundred five".