79048089721 has 4 divisors (see below), whose sum is σ = 79747630452. Its totient is φ = 78348548992.

The previous prime is 79048089689. The next prime is 79048089821. The reversal of 79048089721 is 12798084097.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41723781696 + 37324308025 = 204264^2 + 193195^2 .

It is a cyclic number.

It is not a de Polignac number, because 79048089721 - 2⁵ = 79048089689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79048089821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349770196 + ... + 349770421.

It is an arithmetic number, because the mean of its divisors is an integer number (19936907613).

Almost surely, 2^79048089721 is an apocalyptic number.

It is an amenable number.

79048089721 is a deficient number, since it is larger than the sum of its proper divisors (699540731).

79048089721 is a wasteful number, since it uses less digits than its factorization.

79048089721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699540730.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 79048089721 in words is "seventy-nine billion, forty-eight million, eighty-nine thousand, seven hundred twenty-one".