78265722317 has 8 divisors (see below), whose sum is σ = 82395028800. Its totient is φ = 74137421664.

The previous prime is 78265722299. The next prime is 78265722361. The reversal of 78265722317 is 71322756287.

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 78265722317 - 2¹⁸ = 78265460173 is a prime.

It is a super-2 number, since 2×78265722317² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78265722217) 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, 89033 + ... + 405534.

It is an arithmetic number, because the mean of its divisors is an integer number (10299378600).

Almost surely, 2^78265722317 is an apocalyptic number.

It is an amenable number.

78265722317 is a deficient number, since it is larger than the sum of its proper divisors (4129306483).

78265722317 is a wasteful number, since it uses less digits than its factorization.

78265722317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502915.

The product of its digits is 1975680, while the sum is 50.

The spelling of 78265722317 in words is "seventy-eight billion, two hundred sixty-five million, seven hundred twenty-two thousand, three hundred seventeen".