79206551581 has 8 divisors (see below), whose sum is σ = 81903321344. Its totient is φ = 76518639360.

The previous prime is 79206551531. The next prime is 79206551591. The reversal of 79206551581 is 18515560297.

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 79206551581 - 2¹¹ = 79206549533 is a prime.

It is a super-2 number, since 2×79206551581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79206551531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2196195 + ... + 2231968.

It is an arithmetic number, because the mean of its divisors is an integer number (10237915168).

Almost surely, 2^79206551581 is an apocalyptic number.

It is an amenable number.

79206551581 is a deficient number, since it is larger than the sum of its proper divisors (2696769763).

79206551581 is a wasteful number, since it uses less digits than its factorization.

79206551581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428771.

The product of its (nonzero) digits is 756000, while the sum is 49.

The spelling of 79206551581 in words is "seventy-nine billion, two hundred six million, five hundred fifty-one thousand, five hundred eighty-one".