78329561091 has 8 divisors (see below), whose sum is σ = 106409970000. Its totient is φ = 51234429792.

The previous prime is 78329561083. The next prime is 78329561159. The reversal of 78329561091 is 19016592387.

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

It is not a de Polignac number, because 78329561091 - 2³ = 78329561083 is a prime.

It is a super-2 number, since 2×78329561091² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78329561081) 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, 246319216 + ... + 246319533.

It is an arithmetic number, because the mean of its divisors is an integer number (13301246250).

Almost surely, 2^78329561091 is an apocalyptic number.

78329561091 is a deficient number, since it is larger than the sum of its proper divisors (28080408909).

78329561091 is a wasteful number, since it uses less digits than its factorization.

78329561091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492638805.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 78329561091 in words is "seventy-eight billion, three hundred twenty-nine million, five hundred sixty-one thousand, ninety-one".