79819145549 has 32 divisors (see below), whose sum is σ = 95033917440. Its totient is φ = 66082161600.

The previous prime is 79819145537. The next prime is 79819145579. The reversal of 79819145549 is 94554191897.

It is a happy number.

It is not a de Polignac number, because 79819145549 - 2¹² = 79819141453 is a prime.

It is a super-2 number, since 2×79819145549² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 79819145491 and 79819145500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79819145509) 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 31 ways as a sum of consecutive naturals, for example, 23846294 + ... + 23849640.

It is an arithmetic number, because the mean of its divisors is an integer number (2969809920).

Almost surely, 2^79819145549 is an apocalyptic number.

79819145549 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

79819145549 is a deficient number, since it is larger than the sum of its proper divisors (15214771891).

79819145549 is a wasteful number, since it uses less digits than its factorization.

79819145549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561.

The product of its digits is 16329600, while the sum is 62.

The spelling of 79819145549 in words is "seventy-nine billion, eight hundred nineteen million, one hundred forty-five thousand, five hundred forty-nine".