78321535099 has 8 divisors (see below), whose sum is σ = 79302439440. Its totient is φ = 77341518336.

The previous prime is 78321535079. The next prime is 78321535109. The reversal of 78321535099 is 99053512387.

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 78321535099 - 2⁵ = 78321535067 is a prime.

It is a super-2 number, since 2×78321535099² (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 (78321535009) 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 7 ways as a sum of consecutive naturals, for example, 43414 + ... + 398155.

It is an arithmetic number, because the mean of its divisors is an integer number (9912804930).

Almost surely, 2^78321535099 is an apocalyptic number.

78321535099 is a deficient number, since it is larger than the sum of its proper divisors (980904341).

78321535099 is a wasteful number, since it uses less digits than its factorization.

78321535099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443789.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 78321535099 in words is "seventy-eight billion, three hundred twenty-one million, five hundred thirty-five thousand, ninety-nine".