79016685491689 has 27 divisors (see below), whose sum is σ = 87057199597431. Its totient is φ = 71664901376640.

The previous prime is 79016685491687. The next prime is 79016685491707. The reversal of 79016685491689 is 98619458661097.

The square root of 79016685491689 is 8889133.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 32336088909289 + 46680596582400 = 5686483^2 + 6832320^2 .

It is not a de Polignac number, because 79016685491689 - 2¹ = 79016685491687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79016685491687) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 63263958937 + ... + 63263960185.

Almost surely, 2^{79016685491689} is an apocalyptic number.

79016685491689 is the 8889133-rd square number.

79016685491689 is the 4444567-th centered octagonal number.

It is an amenable number.

79016685491689 is a deficient number, since it is larger than the sum of its proper divisors (8040514105742).

79016685491689 is an frugal number, since it uses more digits than its factorization.

79016685491689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814 (or 1907 counting only the distinct ones).

The product of its (nonzero) digits is 1410877440, while the sum is 79.

The spelling of 79016685491689 in words is "seventy-nine trillion, sixteen billion, six hundred eighty-five million, four hundred ninety-one thousand, six hundred eighty-nine".