78213725328705 has 16 divisors (see below), whose sum is σ = 125144582830080. Its totient is φ = 41713112740608.

The previous prime is 78213725328623. The next prime is 78213725328707. The reversal of 78213725328705 is 50782352731287.

It is a happy number.

It is not a de Polignac number, because 78213725328705 - 2⁴⁰ = 77114213700929 is a prime.

It is a super-2 number, since 2×78213725328705² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78213725328707) 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, 53891320 + ... + 55323609.

It is an arithmetic number, because the mean of its divisors is an integer number (7821536426880).

Almost surely, 2^{78213725328705} is an apocalyptic number.

It is an amenable number.

78213725328705 is a deficient number, since it is larger than the sum of its proper divisors (46930857501375).

78213725328705 is a wasteful number, since it uses less digits than its factorization.

78213725328705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109262680.

The product of its (nonzero) digits is 39513600, while the sum is 60.

The spelling of 78213725328705 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred twenty-five million, three hundred twenty-eight thousand, seven hundred five".