78322539851 has 4 divisors (see below), whose sum is σ = 78340805400. Its totient is φ = 78304274304.

The previous prime is 78322539817. The next prime is 78322539853. The reversal of 78322539851 is 15893522387.

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 78322539851 - 2⁶ = 78322539787 is a prime.

It is a super-4 number, since 4×78322539851⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78322539793 and 78322539802.

It is not an unprimeable number, because it can be changed into a prime (78322539853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9126341 + ... + 9134918.

It is an arithmetic number, because the mean of its divisors is an integer number (19585201350).

Almost surely, 2^78322539851 is an apocalyptic number.

78322539851 is a deficient number, since it is larger than the sum of its proper divisors (18265549).

78322539851 is a wasteful number, since it uses less digits than its factorization.

78322539851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18265548.

The product of its digits is 3628800, while the sum is 53.

The spelling of 78322539851 in words is "seventy-eight billion, three hundred twenty-two million, five hundred thirty-nine thousand, eight hundred fifty-one".