79078501681 has 9 divisors (see below), whose sum is σ = 79573400473. Its totient is φ = 78586667140.

The previous prime is 79078501643. The next prime is 79078501709. The reversal of 79078501681 is 18610587097.

The square root of 79078501681 is 281209.

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

It is not a de Polignac number, because 79078501681 - 2⁷ = 79078501553 is a prime.

It is a super-2 number, since 2×79078501681² (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 (79078501631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 50335626 + ... + 50337196.

Almost surely, 2^79078501681 is an apocalyptic number.

79078501681 is the 281209-th square number.

79078501681 is the 140605-th centered octagonal number.

It is an amenable number.

79078501681 is a deficient number, since it is larger than the sum of its proper divisors (494898792).

79078501681 is an frugal number, since it uses more digits than its factorization.

79078501681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500 (or 1750 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 52.

The spelling of 79078501681 in words is "seventy-nine billion, seventy-eight million, five hundred one thousand, six hundred eighty-one".